Photoelectric detection device and photoelectric detection method

Abstract

The application provides an optoelectronic detection device and method. The device comprises an optoelectronic sensing unit, a direct current signal processing unit, an alternating current signal processing unit and a signal post-processing unit. The optoelectronic sensing unit is used to obtain a light signal that is not blocked by a to-be-detected object and convert the light signal into a first electric signal. The direct current signal processing unit and the alternating current signal processing unit are connected in parallel between the optoelectronic sensing unit and the signal post-processing unit. The direct current signal processing unit is used to perform a first processing operation on the first electric signal to obtain a second electric signal and send the second electric signal to the signal post-processing unit. The alternating current signal processing unit is used to convert the first electric signal into an alternating current signal and send the alternating current signal to the signal post-processing unit. The signal post-processing unit is used to determine the use state of the to-be-detected object based on the second electric signal and the alternating current signal. The device can significantly improve the detection accuracy of the use state of the to-be-detected object.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optoelectronic information technology, in particular to an optoelectronic detection device and an optoelectronic detection method. BACKGROUND

[0002] With the development of optoelectronic information technology, optoelectronic detection technology is widely used in various fields, and optoelectronic sensors are used to detect various objects.

[0003] For example, in the detection of wafer cutting knives. When cutting wafers precisely, many factors such as impurities on the workpiece surface, uneven material, improper cutting depth, and insufficient knife cooling may cause the knife to wear, break, and have edge collapse (such as front collapse, back collapse, corner drop, and cracks), and other adverse use states, thereby affecting the cutting effect of the wafer and causing unnecessary resource waste.

[0004] To solve the above problems, in some prior art, an optical fiber sensor is used to detect the light signal not blocked by the knife, a direct current signal processing circuit is used to process the electrical signal converted by the light signal, and the use state of the wafer cutting knife is monitored in real time. However, since the adverse use state of the knife is complex and variable, and only the direct current signal processing circuit is used to detect the knife state, the judgment result of the knife state is not accurate enough, so it is not possible to effectively identify the various adverse use states of the wafer cutting knife. SUMMARY

[0005] To at least partially solve the above technical problems, the present application provides an optoelectronic detection device, comprising: an optoelectronic sensing unit, a direct current signal processing unit, an alternating current signal processing unit, and a signal post-processing unit, wherein the optoelectronic sensing unit is configured to obtain a light signal not blocked by a to-be-detected object and convert the light signal into a first electrical signal; the direct current signal processing unit and the alternating current signal processing unit are connected in parallel between the optoelectronic sensing unit and the signal post-processing unit, the direct current signal processing unit is configured to receive the first electrical signal, perform a first processing operation on the first electrical signal to obtain a second electrical signal, and send the second electrical signal to the signal post-processing unit; the alternating current signal processing unit is configured to receive the first electrical signal, convert the first electrical signal into an alternating current signal, and send the alternating current signal to the signal post-processing unit; and the signal post-processing unit is configured to determine a use state of the to-be-detected object based on the second electrical signal and the alternating current signal.

[0006] Exemplarily, the optoelectronic sensing unit comprises a light sensor and a photoelectric converter connected in series, wherein the light sensor is configured to detect the light signal; and the photoelectric converter is configured to receive the light signal and convert the light signal into the first electrical signal.

[0007] Exemplarily, the direct current signal processing unit comprises a voltage dividing circuit, wherein the voltage dividing circuit is configured to perform voltage dividing processing on the first electrical signal.

[0008] Exemplarily, the direct current signal processing unit further comprises a first amplifier, wherein the voltage dividing circuit and the first amplifier are connected in series between the photoelectric sensing unit and the signal post-processing unit, and the first amplifier is configured to amplify the voltage-divided first electric signal to obtain a second electric signal.

[0009] Exemplarily, the signal post-processing unit comprises an analog-to-digital converter and a controller connected in series, wherein the analog-to-digital converter is configured to receive the second electric signal and the alternating current signal, and convert the second electric signal and the alternating current signal into a second digital signal and a third digital signal respectively; and the controller is configured to receive the second digital signal and the third digital signal, and determine the use state of the object to be measured based on the second digital signal and / or the third digital signal.

[0010] Exemplarily, the alternating current signal processing unit comprises a direct current signal filter and a second amplifier connected in series, wherein the direct current signal filter is configured to filter out the direct current signal in the first electric signal to obtain a filtered first electric signal; and the second amplifier is configured to amplify the filtered first electric signal to obtain the alternating current signal, and send the alternating current signal to the signal post-processing unit, wherein the amplification multiple of the second amplifier is adjustable, so that the electrical parameter of the peak of the alternating current signal is always within a first preset interval when the use state of the object to be measured is the damaged state.

[0011] Exemplarily, the controller is connected with the second amplifier, and the controller is further configured to: change the amplification multiple of the second amplifier within a second preset interval based on at least the previous alternating current signal, so that the electrical parameter of the peak of the alternating current signal is always within the first preset interval when the use state of the object to be measured is the damaged state, wherein the first preset interval is from a first percentage of the range of the analog-to-digital converter to a second percentage of the range of the analog-to-digital converter.

[0012] Exemplarily, the object to be measured comprises a circular cutting knife, and the photoelectric sensing unit comprises a light emitting module and a light receiving module, wherein the light emitting module and the light receiving module are configured to be arranged on two sides of the edge of the circular cutting knife respectively, the light emitting module is configured to emit a light signal, and the light receiving module is configured to receive the light signal emitted by the light emitting module and not blocked by the circular cutting knife, and convert the received light signal into a first electric signal.

[0013] Exemplarily, the use state of the circular cutting knife comprises a wear state and a total loss state, and the signal post-processing unit determines the use state of the object to be measured based on the second digital signal specifically comprises: for a case that the electrical parameter of the second digital signal is greater than a first threshold value and less than a second threshold value within at least a first preset time length, determining that the circular cutting knife is in the wear state; and for a case that the electrical parameter of the second digital signal is greater than the second threshold value within at least a second preset time length, determining that the circular cutting knife is in the total loss state.

[0014] Exemplarily, the using state of the circular cutting knife includes a defective state, and the determining the using state of the object to be measured based on the alternating current signal specifically includes performing the following operation: for a case that the duration of the electrical parameter of the wave crest of the alternating current signal being greater than or equal to the third threshold value is greater than the third preset duration, determining that the object to be measured is in the defective state.

[0015] According to the second aspect of the present application, a photoelectric detection method is further provided, which includes: acquiring a light signal not blocked by an object to be measured, and converting the light signal into a first electrical signal; performing a first processing operation on the first electrical signal to obtain a second electrical signal; converting the first electrical signal into an alternating current signal; and determining a using state of the object to be measured based on the second electrical signal and the alternating current signal.

[0016] Exemplarily, the performing the first processing operation on the first electrical signal to obtain the second electrical signal includes: performing a voltage division processing on the first electrical signal.

[0017] Exemplarily, the determining the using state of the object to be measured based on the second electrical signal and the alternating current signal includes: converting the second electrical signal and the alternating current signal into a second digital signal and a third digital signal respectively; and determining the using state of the object to be measured based on the second digital signal and / or the third digital signal.

[0018] Exemplarily, the converting the first electrical signal into the alternating current signal includes: filtering out a direct current signal in the first electrical signal to obtain a filtered first electrical signal; and amplifying the filtered first electrical signal by using a second amplifier to obtain the alternating current signal, wherein an amplification multiple of the second amplifier is adjustable, so that the electrical parameter of the wave crest of the alternating current signal is always within a first preset interval when the using state of the object to be measured is the defective state.

[0019] Exemplarily, the method further includes: when the electrical parameter of the wave crest of the alternating current signal in the previous third preset duration is greater than the maximum value of the first preset interval, reducing the amplification multiple of the second amplifier; and when the electrical parameter of the wave crest of the alternating current signal in the previous third preset duration is less than the minimum value of the first preset interval, adjusting the amplification multiple of the second amplifier within a second preset interval.

[0020] Exemplarily, the object to be measured includes a circular cutting knife, and the using state includes a worn state and a total loss state, wherein the determining the using state of the object to be measured based on the second digital signal and / or the alternating current signal includes: for a case that the electrical parameter of the second digital signal is greater than a first threshold value and less than a second threshold value within at least a first preset duration, determining that the circular cutting knife is in the worn state; and for a case that the electrical parameter of the second digital signal is greater than the second threshold value within at least a second preset duration, determining that the circular cutting knife is in the total loss state.

[0021] Exemplarily, the object to be detected includes a circular cutting knife, and the use state includes a damaged state, wherein the use state of the object to be detected is determined based on the second digital signal and / or the alternating-current signal, including: in a case where a duration of the electrical parameter of the wave crest of the alternating-current signal being greater than or equal to the third threshold value is greater than a third preset duration, it is determined that the object to be detected is in the damaged state.

[0022] According to the above scheme of the present application, the optical signal not blocked by the object to be detected is obtained by the photoelectric sensing unit and converted into an electrical signal, and then the direct-current signal processing unit and the alternating-current signal processing unit in parallel respectively perform different processing operations on the electrical signal to obtain a direct-current signal and an alternating-current signal. The state information of the object to be detected is determined after the direct-current signal and the alternating-current signal from the two paths are comprehensively processed by the signal post-processing unit. Thus, the detection and judgment of the use state information of the object to be detected are realized through two different electrical signal processing paths, and the detection accuracy of the use state of the object to be detected is significantly improved.

[0023] A series of simplified concepts are introduced in the summary, which will be further described in detail in the specific embodiments. The summary part does not mean to try to limit the key features and necessary technical features of the claimed technical solution, nor to try to determine the protection scope of the claimed technical solution.

[0024] The advantages and features of the present application will be described in detail below in combination with the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0025] The following drawings of the present application are hereby incorporated as part of the present application for understanding the present application. The embodiments of the present application and their description shown in the drawings are used to explain the principles of the present application. In the drawings,

[0026] Figure 1 is a schematic block diagram of a photoelectric detection device according to an embodiment of the present application;

[0027] Figure 2 is a schematic diagram of the working principle of a photoelectric sensing unit according to an embodiment of the present application;

[0028] Figure 3 is a voltage schematic diagram of a second digital signal according to an embodiment of the present application;

[0029] Figure 4 is a voltage schematic diagram of an alternating-current signal according to an embodiment of the present application;

[0030] Figure 5 is a schematic block diagram of a photoelectric detection device according to another embodiment of the present application; and

[0031] Figure 6This is a schematic flowchart of a photoelectric detection method according to an embodiment of the present invention. Detailed Implementation

[0032] In the following description, numerous details are provided to enable a thorough understanding of the invention. However, those skilled in the art will appreciate that the following description pertains only to preferred embodiments of the invention, and that the invention can be practiced without one or more of these details. Furthermore, to avoid confusion with the invention, some technical features well-known in the art have not been described.

[0033] To address the aforementioned technical problems, according to one aspect of the present invention, a photoelectric detection device is provided. This photoelectric detection device can be applied to the detection of any suitable object to be tested. The object to be tested by the photoelectric detection device can be any suitable target entity that needs to be detected. For example, the object to be tested can be certain critical and easily worn components in the operation of automated equipment, and the wear of these components may cause changes in their shape. The usage status of the components can be detected based on this shape change. For example, the object to be tested can be an industrial cutting blade in operation. It is easy to understand that when using an industrial cutting blade to perform an automatic cutting task, the wear of the blade gradually increases with the increase of cutting time, and sometimes, due to the influence of the material being cut, the blade edge may even break, thus greatly affecting the cutting effect and causing unnecessary waste in industry. Therefore, a photoelectric detection device can be used to monitor the usage status of the cutting blade in real time.

[0034] For simplicity, the following explanation will use an industrial cutting blade as an example to illustrate the photoelectric detection device and its working principle according to an embodiment of the present invention.

[0035] Figure 1 A schematic block diagram of a photoelectric detection device according to an embodiment of the present invention is shown. Figure 1 As shown, the photoelectric detection device 100 includes: a photoelectric sensing unit 110, a DC signal processing unit 120, an AC signal processing unit 130, and a signal post-processing unit 140. The photoelectric sensing unit 110 acquires a light signal not obstructed by the object under test and converts the light signal into a first electrical signal. The DC signal processing unit 120 and the AC signal processing unit 130 are connected in parallel between the photoelectric sensing unit 110 and the signal post-processing unit 140. The DC signal processing unit 120 receives the first electrical signal, performs a first processing operation on the first electrical signal to obtain a second electrical signal, and sends the second electrical signal to the signal post-processing unit. The AC signal processing unit 130 receives the first electrical signal, converts the first electrical signal into an AC signal, and sends the AC signal to the signal post-processing unit 140. The signal post-processing unit 140 determines the usage state of the object under test based on the second electrical signal and the AC signal.

[0036] The photoelectric detection device 100 comprises a photoelectric sensing unit 110. The photoelectric sensing unit 110 is configured to acquire a light signal that is not blocked by the object to be detected and convert the light signal into a first electrical signal. Exemplarily, the photoelectric sensing unit can comprise any existing or future electronic component that can realize the acquisition of the light signal and the conversion of the photoelectric signal, and the present application does not limit the same.

[0037] Exemplarily, the photoelectric sensing unit 110 can be composed of one electronic component, or can be composed of multiple electronic components, and the present application does not limit the same. Optionally, the light signal that is not blocked by the object to be detected can be acquired by one electronic component, and the acquired signal can be converted into the first electrical signal by the same electronic component. Alternatively, the light signal that is not blocked by the object to be detected can be acquired by one electronic component, and then the light signal can be received by another electronic component and converted into the first electrical signal.

[0038] The light signal is the propagation information of light, and the light information can be obtained through the light signal. The light information can be various information representing physical quantities of light. Exemplarily but not limitatively, the information represented by the light signal can be luminous flux information used to represent the spectral radiant power size after the radiant power is affected by the visual function of the human eye.

[0039] Exemplarily, a light source can be included in the photoelectric sensing unit 110, or a light source can be included in the environment in which the object to be detected is located. Exemplarily, the light source can be any suitable line light source or point light source, including but not limited to a laser diode, an ultraviolet LED point light source, and the like. Exemplarily, the light source can be placed on one side of the object to be detected, and in the case that the object to be detected does not completely block the light source, the light signal that is not blocked by the object to be detected can be obtained by the photoelectric sensing unit 110 placed on the other side of the object to be detected. As described above, the use state of the object to be detected can change over time, such as wear, damage, and edge collapse, etc. The change of the use state of the object to be detected can be manifested as a change in the shape of the object to be detected. Thus, in the case that the relative position between the object to be detected and the photoelectric sensing unit 110 does not change, the light signal blocked by the object to be detected will change accordingly, and correspondingly, the light signal that is not blocked by the object to be detected will also change accordingly. In the example that the object to be detected is an industrial cutting knife, the light signal that is not blocked by the cutting knife during the cutting process can be acquired in real time by the photoelectric sensing unit 110, and the light signal can be converted into the first electrical signal.

[0040] The voltage or current of the electrical signal varies with time. The first electrical signal can be a voltage signal or a current signal. According to the foregoing statement, the first electrical signal is converted from the optical signal, thus when the optical signal changes, the first electrical signal can also change accordingly. For example, when the light flux of the optical signal which is not blocked by the object to be measured increases, the voltage or current of the first electrical signal can also increase accordingly. The first electrical signal according to the embodiment of the present application can be an analog electrical signal, for example, an analog voltage signal.

[0041] The photoelectric detection device 100 further comprises a direct current signal processing unit 120. The direct current signal processing unit 120 is configured to receive the first electrical signal, perform a first processing operation on the first electrical signal to obtain a second electrical signal, and send the second electrical signal to the signal post-processing unit 140. Exemplarily, the first processing operation performed by the direct current signal processing unit 120 can include various processing operations for facilitating the signal post-processing unit 140 to effectively extract the information of the object to be measured contained in the first electrical signal, including but not limited to any suitable processing operation such as voltage division processing, filtering processing, signal amplification processing, digital-to-analog conversion processing, etc. on the first electrical signal.

[0042] According to the embodiment of the present application, the first processing operation of the direct current signal processing unit 120 can be an operation for processing the direct current component in the first electrical signal. For example, both direct current component and alternating current component can be included in the first electrical signal, and the direct current signal processing unit 120 can obtain the direct current component therein through the first processing operation on the first electrical signal. Optionally, a rectifier can be included in the direct current signal processing unit 120. The first processing operation can include a filtering operation for filtering out the alternating current component in the first electrical signal. In this case, the second electrical signal can only include the direct current component.

[0043] Exemplarily, the second electrical signal can be an analog electrical signal or a digital electrical signal. In the example where the second electrical signal is a digital electrical signal, the direct current signal processing unit 120 can include an analog-to-digital converter, which can convert the analog electrical signal into a digital electrical signal.

[0044] Exemplarily, any existing or future electronic component(s) that can implement the above-mentioned first processing operation can be included in the direct current signal processing unit 120, and the present application does not limit thereto.

[0045] The photoelectric detection device 100 further comprises an alternating current signal processing unit 130. The alternating current signal processing unit 130 can be configured to receive the first electric signal, convert the first electric signal into an alternating current signal, and send the alternating current signal to a signal post-processing unit 140. The alternating current signal processing unit 130 can be configured to perform a second processing operation on the first electric signal. According to an embodiment of the present application, the second processing operation can comprise an operation of converting the first electric signal into an alternating current signal. Exemplarily, in the case that the first electric signal comprises a direct current component and an alternating current component, the direct current component can be filtered out by a direct current filtering operation to obtain the alternating current signal. According to an embodiment of the present application, any existing or future electronic component that can realize filtering of a direct current signal can be comprised in the alternating current signal processing unit 130, and the present application is not limited thereto. Similarly to the direct current signal processing unit 120, the second processing operation can further comprise other processing operations, such as analog-digital conversion processing, signal amplification processing, etc., which are performed to facilitate the signal post-processing unit 140 to effectively extract information of the object under test contained in the alternating current component of the first electric signal. Different electronic components can be set to realize desired signal processing functions according to actual detection needs.

[0046] It can be understood that the object under test can not be uniformly worn during use. Still taking the cutting knife as an example, the edge of the cutting knife can be broken due to the material of the workpiece surface and other reasons. The broken edge of the cutting knife will inevitably cause the light signal that is not blocked by the cutting knife to change suddenly in a short time. If the photoelectric detection is simply performed by the direct current signal processing unit 120, the time of the sudden change of the first electric signal can be very short due to the small area of the broken edge, and thus it is difficult to detect the change of the use state. However, the alternating current signal processing unit 130 is mainly configured to detect the alternating current component in the first electric signal. Therefore, it is more sensitive to the signal mutation of the first electric signal. Therefore, the alternating current signal processing unit 130 in combination with the direct current signal processing unit 120 can more accurately detect the change of the use state of the object under test.

[0047] The photoelectric detection device 100 can further comprise a signal post-processing unit 140. The signal post-processing unit 140 is configured to determine the use state of the object under test based on the second electric signal and the alternating current signal. The use state of the object under test can comprise a normal state or an abnormal state of the object under test. In the foregoing example in which the object under test is an industrial cutting knife, the use state of the object under test can comprise a normal state in which the cutting knife can be normally used, or an abnormal state in which the cutting knife is difficult to be normally used. The abnormal state of the cutting knife can be further divided into different degrees of abnormal state. According to an embodiment of the present application, different use states of the object under test to be detected by the photoelectric detection device 100 can be set according to different objects under test and different actual detection needs.

[0048] According to the above scheme of the present application, the photoelectric sensing unit 110 acquires the light signal not blocked by the object to be detected and converts it into an electric signal, and then the DC signal processing unit 120 and the AC signal processing unit 130 in parallel perform different processing operations on the electric signal, respectively obtaining a DC signal and an AC signal. The signal post-processing unit comprehensively processes the DC signal and the AC signal from the two paths to determine the state information of the object to be detected. Thus, the detection and judgment of the state information of the object to be detected are realized through two different electric signal processing paths, significantly improving the detection accuracy of the use state of the object to be detected.

[0049] Exemplarily, the photoelectric sensing unit comprises a light sensor and a photoelectric converter connected in series. The light sensor is configured to detect the light signal; and the photoelectric converter is configured to receive the light signal and convert the light signal into a first electric signal.

[0050] According to the embodiment of the present application, the photoelectric sensing unit can comprise a light sensor, which can be configured to sense the light signal. The light sensor can be located on both sides of the edge of the object to be detected, and the light source emits light towards the light sensor. Part of the light signal is blocked by the object to be detected, and the light sensor can detect the light signal not blocked by the object to be detected, so as to convert the state of the object to be detected into the measured light signal. Exemplarily, the light sensor can be any existing or future light sensor, such as an ambient light sensor, an infrared light sensor, a sunlight sensor, an ultraviolet light sensor, etc., and the present application does not limit it as long as it can realize the conversion of the state of the object to be detected into the measured light signal.

[0051] According to the embodiment of the present application, the photoelectric sensing unit can further comprise a photoelectric converter connected with the above-mentioned light sensor, which can receive the output light signal and realize the conversion from the light signal to the electric signal. Exemplarily, the photoelectric converter can be any existing or future electronic component that can realize the conversion from the light signal to the electric signal, and the present application does not limit it.

[0052] Exemplarily, the object to be detected can be an industrial cutting knife. The light sensor can detect the light signal. At the same time when the state of the knife changes, the physical quantity of the detected light signal, such as luminous flux, will change. The light sensor can output the light signal, such as luminous flux, to the photoelectric converter. After receiving the light signal, the photoelectric converter can convert the light signal into an electric signal. It can be understood that, since the luminous flux of the light signal changes, the electrical parameter of the electric signal output by the photoelectric sensor, such as voltage, may change. Thus, the use state of the object to be detected can be detected according to the changed electric signal.

[0053] The photoelectric sensing unit composed of the light sensor and the photoelectric converter can convert the state of the object to be measured into an electrical signal that can be measured and recognized in real time, facilitating real-time judgment of the use state of the object to be measured based on the electrical signal. The method is simple and easy to implement, and has high detection efficiency.

[0054] Exemplarily, the object to be measured includes a circular cutting knife, and the photoelectric sensing unit includes a light emitting module and a light receiving module. The light emitting module and the light receiving module are arranged on two sides of the edge of the circular cutting knife respectively. The light emitting module is configured to emit a light signal, and the light receiving module is configured to receive the light signal emitted by the light emitting module and not blocked by the circular cutting knife and convert the received light signal into a first electrical signal.

[0055] According to the embodiment of the present application, the object to be measured can be a circular cutting knife. Exemplarily, the circular cutting knife can be an industrial cutting knife of any size, any material, and any purpose, as long as it is circular, and the present application does not limit it. It can be understood that in use, the circular cutting knife can rotate around a fixed shaft to cut a workpiece. The workpiece is, for example, a wafer.

[0056] According to the embodiment of the present application, the light emitting module and the light receiving module can be arranged on two sides of the edge of the circular cutting knife respectively. In one example, the light emitting module can be arranged on the upper side of the circular cutting knife, and the light receiving module can be arranged on the lower side of the circular cutting knife. Of course, the light emitting module can also be arranged on the lower side and the light receiving module can be arranged on the upper side.

[0057] Exemplarily, the light emitting module can be in any possible form capable of emitting a light signal, and the present application does not limit it. Exemplarily, the light emitting module can include a light-emitting diode, a laser diode, etc.

[0058] Exemplarily, the light receiving module can be in any possible form of electronic component capable of receiving a light signal and converting the received light signal into an electrical signal, and the present application does not limit it.

[0059] In one example, the light receiving module can include a light sensor and a photoelectric converter. The light sensor can receive the light signal output by the light emitting module and not blocked by the circular cutting knife. Exemplarily, the photoelectric converter can be connected with the light sensor and can convert the light signal received by the light sensor and not blocked by the circular cutting knife into an electrical signal.

[0060] Figure 2 A schematic diagram showing the working principle of the photoelectric sensing unit according to an embodiment of the present application is shown. As shown in the diagram, the light emitting module emits a light signal, and the light receiving module receives the light signal emitted by the light emitting module and not blocked by the circular cutting knife and converts the received light signal into an electrical signal. Figure 2As shown, the circular cutting knife 210 rotates at high speed around the center axis during operation. The light emitting module and the light receiving module can be located on the upper side and the lower side of the edge of the circular cutting knife 210 respectively. Among them, the light emitting module 220 can be located at the upper side first position of the upper surface of the circular cutting knife 210, and the light sensor 230 in the light receiving module can be located at the lower side second position of the lower surface of the circular cutting knife 210. Exemplarily but not limitatively, the light emitting module 220 and the light sensor 230 can be symmetrically located on both sides of the edge of the circular cutting knife 210, and the center axes of the light emitting module 220 and the light sensor 230 coincide. Exemplarily, the above-mentioned first position and second position can be represented by the distance between the light emitting module 220 and the light sensor 230 and the circular cutting knife 210 respectively.

[0061] Exemplarily, by setting appropriate first position and second position, the light signal received by the light sensor 230 and the first electric signal converted by the photoelectric converter can be within an appropriate range. Exemplarily but not limitatively, the range of the light signal can be represented by the proportion of the light flux, for example, any appropriate value between 0% and 100%. It is easy to understand that when the light signal emitted by the light emitting module 220 is completely blocked by the circular cutting knife 210, the proportion of the light flux can be 0%; when all the light signal emitted by the light emitting module 220 is not blocked by the circular cutting knife 210, the proportion of the light flux can be 100%.

[0062] Exemplarily, the photoelectric converter in the light receiving module can convert the light flux signal into a voltage signal. Optionally, the first electric signal is, for example, a voltage signal. It is easy to understand that in the case that the proportion of the light flux received by the light sensor 230 and not blocked by the circular cutting knife is 100%, the voltage signal output by the photoelectric converter can be the maximum voltage value; and in the case that the proportion of the light flux received by the light sensor 230 and not blocked by the circular cutting knife is 0%, the voltage signal output by the photoelectric detection device can be the minimum voltage value.

[0063] In another example, the photoelectric sensing unit can also include a fiber amplifier for amplifying the received relatively weak light signal at the front end of the photoelectric converter, or amplifying the converted initial voltage signal at the rear end of the photoelectric converter, so that the converted or amplified first electric signal can be effectively and accurately identified. Those skilled in the art can easily understand its implementation principle and implementation manner, which will not be described here.

[0064] It is easy to understand that the circular cutting knife can rotate at a constant speed around the center axis of the knife during the cutting operation. In the normal use state of the knife, after the optical signal emitted by the optical fiber emission module irradiates on the surface of the knife, the optical signal received by the optical fiber receiving module can be consistent with the initial signal, so that the optical signal does not change. When the knife is in an abnormal use state, the optical signal received by the optical fiber receiving module is necessarily different from the initial signal, for example, it may fluctuate regularly, so that the converted first electrical signal can be processed to analyze the regularity and reason of the change, so that the use state of the knife can be accurately determined, and effective treatment measures can be taken in time. And the device using the optical emission module and the optical receiving module to collect signals has a simpler structure and lower implementation cost.

[0065] Exemplarily, the direct current signal processing unit comprises a voltage dividing circuit, wherein the voltage dividing circuit is configured to perform voltage dividing processing on the first electrical signal.

[0066] According to the foregoing statement, the two ends of the direct current signal processing unit in the photoelectric detection device 100 are connected with the photoelectric sensing unit and the signal post-processing unit respectively, for receiving the first electrical signal transmitted by the photoelectric sensing unit, and performing a first processing operation on the first electrical signal to obtain a second electrical signal, and outputting the second electrical signal to the signal post-processing unit. According to the embodiment of the present application, the direct current signal processing unit can comprise any suitable form of voltage dividing circuit as long as it can perform voltage dividing processing on the received first electrical signal, and the present application does not limit it.

[0067] In one example, the voltage dividing circuit can be a circuit comprising one or more voltage dividing resistors. The first electrical signal can be a voltage signal, and the first electrical signal output by the photoelectric sensing unit can be subjected to voltage dividing processing by the voltage dividing resistors to reduce the signal voltage value output thereby, so that the voltage value after voltage dividing is within a first voltage range. Exemplarily but not limitatively, the first voltage range can be a voltage range that can be received or effectively recognized by the signal post-processing unit, for example, 0-1V.

[0068] After the direct current signal processing unit performs voltage dividing processing on the first electrical signal through the voltage dividing circuit, the obtained electrical signal can be controlled within a suitable range to improve the effectiveness of signal recognition and the accuracy of detection.

[0069] Exemplarily, the direct current signal processing unit further comprises a first amplifier. The foregoing voltage dividing circuit and the first amplifier can be connected in series between the photoelectric sensing unit and the signal post-processing unit, and the first amplifier is configured to amplify the voltage-divided first electrical signal to obtain the second electrical signal.

[0070] According to the embodiment of the present application, the direct current signal processing unit can comprise a voltage dividing circuit and a first amplifier. The first amplifier can amplify the first electric signal after voltage division to a suitable multiple to obtain a second electric signal. Exemplarily, the first amplifier can be any suitable form of amplifier, including but not limited to various forms of operational amplifier and power amplifier.

[0071] Exemplarily, the amplification multiple of the first amplifier can be a fixed multiple. Optionally, the fixed multiple is, for example, 1. Optionally, the first amplifier can be an amplifier composed of a voltage follower circuit. Exemplarily, the first electric signal can be a voltage signal. After receiving the voltage signal output by the photoelectric sensing unit, the voltage dividing circuit can perform voltage division on the voltage signal to obtain a voltage signal after voltage division that can be effectively recognized by subsequent units. Then, the voltage signal after voltage division can be output to the signal post-processing unit by the voltage follower circuit to avoid interference of the voltage signal by the front and rear circuits.

[0072] The second electric signal obtained by the first amplifier has an electrical parameter such as voltage in a specific range, thereby making the second electric signal more convenient for the signal post-processing unit to process, so as to obtain a more accurate use state detection result of the object to be detected.

[0073] Exemplarily, the alternating current signal processing unit comprises a direct current signal filter and a second amplifier connected in series. The direct current signal filter is used to filter out the direct current signal in the first electric signal to obtain a filtered first electric signal. The second amplifier is used to amplify the filtered first electric signal to obtain an alternating current signal and send the alternating current signal to the signal post-processing unit. The amplification multiple of the second amplifier can be adjusted so that the electrical parameter of the wave crest of the alternating current signal is always within a first preset interval when the use state of the object to be detected is a damaged state.

[0074] According to the embodiment of the present application, the direct current signal filter is connected to the photoelectric sensing unit and can filter the direct current signal in the first electric signal output by the photoelectric sensing unit.

[0075] According to the foregoing example, the light signal detected by the photoelectric sensing unit varies with the different usage states of the object under test. Therefore, the first electric signal output by the photoelectric sensing unit can be a signal of various states in a period of time. For example, the object under test is a circular cutting knife, and in the initial stage of normal operation of the knife, the light flux not blocked by the knife can consistently remain unchanged in the initial state. In this case, the first electric signal output by the photoelectric sensing unit can be a fixed voltage value, for example, 1 V. However, after a period of cutting, the knife is damaged due to some factors, for example, a small gap at a certain position. In this case, when the photoelectric sensing unit is not rotated to the light sensing area at the gap of the knife, the photoelectric sensing unit still outputs a constant voltage signal 1 V. When the photoelectric sensing unit is rotated to the light sensing area at the gap of the knife, the photoelectric sensing unit outputs a voltage value that changes in a waveform, and presents a peak voltage, for example, 2 V, at the maximum gap. The same waveform voltage signal still appears when the photoelectric sensing unit is rotated to the gap for the second time, the third time, and so on. Thus, the first electric signal can be a superposition of a direct current component and an alternating current component. In order to effectively identify the damage state of the object under test, the direct current signal filter can be used to filter the direct current signal in the first electric signal, so that the alternating current component in the first electric signal can be processed separately.

[0076] Exemplarily, the direct current signal filter can be any existing or future electronic component that can realize direct current signal filtering, and the present application is not limited thereto. Exemplarily but not limitatively, the direct current signal filter can be a capacitor in any suitable form. The first electric signal output by the photoelectric sensing unit can be filtered by the capacitor to filter out the direct current component and leave only the alternating current component. Those skilled in the art can easily understand the working principle and implementation of the capacitor, which will not be described here.

[0077] Exemplarily, a second amplifier can be connected after the direct current signal filter. According to an embodiment of the present application, the amplification factor of the second amplifier can be adjustable, and the amplification factor of the second amplifier can be adjusted so that the electrical parameter of the peak of the alternating current signal is always within the first preset interval when the usage state of the object under test is the damage state. Exemplarily, the second amplifier can be various forms of amplification factor amplifiers, and the present application is not limited thereto as long as the amplification factor thereof can be adjusted.

[0078] According to the foregoing statement, when the object under test is a circular cutting knife, the light signal detected by the photoelectric sensing unit changes when the object under test is in the damage state, and therefore the first electric signal also changes accordingly. After the direct current component in the first electric signal is filtered out by the direct current signal filter, the filtered first electric signal can be an alternating current signal that changes periodically.

[0079] In one example, the knife is in a defect state, in which case the change of the light signal is not obvious, and the signal feature of the filtered first electric signal obtained by the direct current signal filter for determining the defect is also not obvious. In order to effectively identify the filtered first electric signal, the gain amplifier can be used to amplify the filtered first electric signal, so that the electrical parameter of the peak of the alternating current signal presented when the knife is in a defect state is always in a preset interval that can be effectively identified. Exemplarily, the first preset interval can be an interval in which the electrical parameter of the peak of the alternating current signal is in an interval that can be effectively identified by the signal post-processing unit.

[0080] In another example, due to the existence of interference factors in the environment, such as dust, water droplets or small particles attached to the edge of the knife, the change of the light signal can also be caused, and the photoelectric sensing unit can also output a first electric signal similar to the defect state of the knife. In this case, it is possible to cause the signal post-processing unit to misidentify the normal state of the knife. Exemplarily, the second amplifier can be used to perform corresponding amplification processing on the filtered first electric signal, so that the electrical parameter of the peak of the alternating current signal presented at least when the knife is in a defect state is always in a first preset interval with better detection accuracy. Exemplarily, the first preset interval can also be an interval in which the electrical parameter of the peak of the alternating current signal is in an interval with better identification accuracy of the signal post-processing unit.

[0081] In the above technical solution, the photoelectric detection device obtains the alternating current component in the first electric signal collected by the photoelectric sensing unit through the direct current signal filter in the alternating current signal processing unit, and then performs controlled amplification processing on the alternating current component through the second amplifier, so that the electrical parameter of the peak of the alternating current signal output by the alternating current signal processing unit when the object to be detected is in a defect state is always in a suitable interval. This scheme can accurately determine the use state of the object to be detected only by using simple electronic components, and has low cost and high detection accuracy.

[0082] Exemplarily, the signal post-processing unit includes an analog-to-digital converter and a controller connected in series. The analog-to-digital converter is configured to receive the second electric signal output by the direct current signal processing unit and the alternating current signal output by the alternating current signal processing unit, and convert the second electric signal and the alternating current signal into a second digital signal and a third digital signal, respectively. The controller is configured to receive the second digital signal and the third digital signal, and determine the use state of the object to be detected based on the second digital signal and / or the third digital signal.

[0083] According to the embodiment of the present application, the analog-to-digital converter can convert the continuous signal in analog form into the discrete signal in digital form, i.e., it can convert the electrical signals output by the direct current signal processing unit and the alternating current signal processing unit into the digital signals that can be processed by the controller. Thus, the controller can perform processing operation based on the digital signals from the two paths respectively to determine the different use states of the object to be measured.

[0084] Exemplarily, the analog-to-digital converter can be a direct analog-to-digital converter or an indirect analog-to-digital converter. It can be any type of analog-to-digital converter, including but not limited to a parallel comparison type analog-to-digital converter, a successive approximation type analog-to-digital converter, a dual integration type analog-to-digital converter, etc.

[0085] Exemplarily, the controller can be any existing or future controller that can process the digital signals, which can be a combinational logic controller or a microprogrammed controller, and the present application does not limit it. Alternatively, the controller in the signal post-processing unit can be a field programmable gate array (FPGA). The controller can perform post-processing on the digital signals of the second electrical signal output by the direct current path and the alternating current signal output by the alternating current path, for example, it can determine the use state of the object to be measured by determining the size of the parameter value of the digital signal and the transformation law of the digital signal.

[0086] According to the above scheme, the detection logic of the photoelectric detection device can be implemented in a digital signal processing manner, which is easier to calculate and can greatly improve the detection rate.

[0087] Exemplarily, the controller is also connected with the second amplifier, for example, directly connected with the second amplifier. The controller is further configured to change the amplification factor of the second amplifier within a second preset interval based on at least the previous alternating current signal, so that the electrical parameter of the wave crest of the alternating current signal is always within a first preset interval when the use state of the object to be measured is the damaged state, wherein the first preset interval is from a first percentage of the range of the analog-to-digital converter to a second percentage of the range of the analog-to-digital converter.

[0088] Exemplarily, the first preset interval can be an interval in which the measurement accuracy of the analog-to-digital converter is in the best state. It is easy to understand that the analog-to-digital converter can have a certain range, for example, it can measure a maximum voltage value of 10V. Moreover, when the voltage value measured by the analog-to-digital converter is within the interval of 50% range to 90% range, the relative error of the measurement of the analog-to-digital converter is the smallest, and the measurement accuracy is relatively high. In this case, the first preset interval can be set to [5V, 9V]. For different analog-to-digital converters, the best measurement accuracy interval can be different, and the first percentage and the second percentage can also be other values. Those skilled in the art can easily understand the principle, and thus the detailed description is omitted here.

[0089] According to the embodiment of the present application, the controller can also be directly electrically connected with the second amplifier to control the amplification multiple of the second amplifier, i.e. to control the amplification multiple of the second amplifier so that the electrical parameter of the wave crest of the alternating current signal is always within the range of the percentage of the range of the analog-to-digital converter when the use state of the object to be measured is the damaged state.

[0090] According to the embodiment of the present application, the controller can change the amplification multiple of the second amplifier within a second preset range based on the alternating current signal output by the alternating current signal processing unit in the previous time period to achieve the control of the amplification multiple of the second amplifier. Exemplarily, the second preset range can be a preset amplification multiple range, for example, (0, 2]. The second preset range can be set according to actual needs, and the present application does not limit it as long as the amplification multiple of the second amplifier can be controlled within a reasonable range without interfering with the determination of the use state of the object to be measured by the controller based on the signal. Exemplarily, the amplification multiple of the second amplifier can be set to multiple amplification multiples. Exemplarily, when the alternating current signal in the previous time period indicates that there is a wave crest and the wave crest voltage is less than 5V, for example, 4V, the controller can control the second amplifier to increase its amplification multiple, for example, to control the amplification multiple of the second amplifier to increase by one step. While when the previous alternating current signal indicates that there is a wave crest and the wave crest voltage exceeds 9V, for example, 10V, the controller can control the second amplifier to decrease its amplification multiple, for example, to control the amplification multiple of the second amplifier to decrease by one step. Thus, the controller can control the amplification multiple of the second amplifier based on the alternating current signal in the previous time period, so as to ensure that the electrical parameter of the wave crest of the alternating current signal is always within the best measurement accuracy range of the analog-to-digital converter when the use state of the object to be measured is the damaged state. This scheme is simple and easy to implement, and can improve the accuracy of the data measured by the analog-to-digital converter and the accuracy of the use state of the object to be measured determined by the controller, so the detection accuracy of the photoelectric detection device is also high.

[0091] As described above, the object to be measured can include a circular cutting knife. Exemplarily, the use state of the circular cutting knife includes a worn state and a completely worn state. The determination of the use state of the object to be measured based on the second digital signal by the signal post-processing unit specifically includes performing the following operations: for the case that the electrical parameter of the second digital signal is greater than the first threshold and less than the second threshold within at least the first preset time length, determining that the circular cutting knife is in the worn state; for the case that the electrical parameter of the second digital signal is greater than the second threshold within at least the first preset time length, determining that the circular cutting knife is in the completely worn state.

[0092] According to an embodiment of the present application, the signal post-processing unit can determine the wear state and the total wear state of the circular cutting knife based on the second digital signal after being processed by the direct current signal processing unit and converted by the analog-to-digital converter.

[0093] Exemplarily, the wear state of the circular cutting knife can be a state in which the wear amount of the cutting edge reaches a preset wear degree as the number of cutting times of the knife increases. In this state, the knife can still continue to cut, but the cutting effect is difficult to guarantee. Or to say, for some workpieces, the knife can still cut qualified workpieces after being worn, while for other workpieces, the knife can be difficult to cut qualified workpieces after being worn. Therefore, different processing operations need to be performed according to the actual situation for the wear state of the knife. And the preset wear degree can be set according to the cutting requirements of the workpiece.

[0094] Exemplarily, the total wear state of the circular cutting knife can be a state in which the outer periphery of the knife has been completely worn or completely broken, and the knife cannot continue to work. In this case, the knife replacement operation needs to be performed immediately, otherwise the workpiece will be damaged, causing unnecessary waste of resources. Or the total wear state of the circular cutting knife can also be a state in which the knife is severely worn and cannot cut the workpiece. The total wear state of the circular cutting knife can be set according to actual needs.

[0095] According to an embodiment of the present application, the wear state and the total wear state of the circular cutting knife can be monitored and determined by the photoelectric detection device. Specifically, the controller can determine whether the circular cutting knife is in a wear state or a total wear state according to the second digital signal converted from the second electrical signal processed by the direct current signal processing unit.

[0096] Figure 3 A voltage curve diagram of the second digital signal according to an embodiment of the present application is shown. In combination with Figure 2 , the optical signal obtained in the photoelectric sensing unit can represent the proportion of light flux that is not blocked by the object to be measured before the light emitted by the light emitting module irradiates the light receiving module. The minimum value of the light flux proportion is, for example, 0%, and the voltage value of the second digital signal after being converted by the direct current signal processing unit and the analog-to-digital converter is the minimum voltage value, for example, the voltage value at the Min position shown in Figure 3 . The maximum value of the light flux proportion is, for example, 100%, and the voltage value of the second digital signal after being converted by the direct current signal processing unit and the analog-to-digital converter is the maximum voltage value, for example, the voltage value at the Max position shown in Figure 3 . In the initial calibration state, after the circular cutting knife is positioned, the unblocked light flux proportion is, for example, 20%, and the voltage value of the corresponding second digital signal can be the initial voltage value corresponding to the time t0.

[0097] After a period of cutting, the knife wears out from time t1, at which time the light flux begins to gradually increase, and the voltage value of the second digital signal also begins to increase. In the case where the knife has not yet reached the preset wear degree, the controller can not send any signal. When the knife reaches the preset wear degree from time t2, at which time the light flux received by the photoelectric sensing unit increases to a certain proportion threshold, for example, 40%, and the voltage value of the second digital signal reaches the first threshold value of the voltage. At this time, the controller can determine that the circular cutting knife may be in a wear state based on the second digital signal received at time t2. Considering that some environmental factors or knife openings may also cause changes in the light flux, in which case the voltage value of the second digital signal may also reach the first threshold value, in order to avoid misjudgment, the circular cutting knife can be determined to be in a wear state only when the voltage value of the second digital signal is identified to reach the first threshold value and not to reach the second threshold value within at least a first preset time length. The first preset time length can be set according to actual conditions, for example, equal to the time length for one or two rotations of the knife. Exemplarily, when the controller determines that the circular cutting knife is in a wear state, the user can be prompted to pay attention to the state of the knife in time and perform corresponding processing operations in the form of sending a first prompt sound or lighting a first indicator light.

[0098] It is easy to understand that in the case where the knife is seriously worn or the outer peripheral cutting edge has been worn out, the light flux detected by the photoelectric sensing unit can reach another proportion threshold, for example, 80%, and the voltage value of the second digital signal received by the controller reaches the second threshold value. In order to exclude the instantaneous interference of other factors on the signal, the controller determines that the circular cutting knife is in a total loss state only when the voltage value of the second digital signal is identified to reach the second threshold value within at least a second preset time length. It can be understood that the second preset time length can also be set according to actual needs. Optionally, the second preset time length is equal to the aforementioned first preset time length. Exemplarily, when the controller determines that the circular cutting knife is in a total loss state, the user can also be reminded to perform processing in the form of sending a second prompt sound or lighting a second indicator light. At the same time, the controller can also connect the control unit of the knife shaft to stop the circular cutting knife from running.

[0099] According to the above scheme, the controller can determine the wear state and total loss state of the circular cutting knife based on whether the second digital signal processed by the direct current signal processing unit and converted by the analog-to-digital converter reaches the preset threshold interval and the duration of the state. This scheme only needs to load simple logical judgment, is simple and easy to implement, consumes less computing resources, and has a higher accuracy of judgment.

[0100] Exemplarily, the use state of the circular cutting tool includes a damaged state, and the signal post-processing unit determines the use state of the object to be measured based on the alternating current signal includes performing the following operation: for the case that the duration of the electrical parameter of the wave crest of the alternating current signal being greater than or equal to the third threshold value is greater than the second preset duration, it is determined that the object to be measured is in the damaged state.

[0101] According to the embodiment of the present application, the controller in the signal post-processing unit can determine the damaged state of the circular cutting tool based on the third digital signal processed by the alternating current signal processing unit and converted by the analog-to-digital converter.

[0102] Exemplarily, the damaged state of the circular cutting tool can be a state in which a notch appears in the cutting edge. The notch can be any size of notch that the tool can have. For tools that perform precision cutting tasks, notches can have a variety of adverse effects on cutting, such as damaging workpieces or reducing the yield of finished products. Therefore, the notch state can be identified in time, and the tool can be replaced in time.

[0103] According to the embodiment of the present application, the damaged state of the circular cutting tool can be monitored and determined by the photoelectric detection device. Specifically, the controller can determine whether the circular cutting tool is in the damaged state based on the alternating current signal output by the alternating current signal processing unit.

[0104] Figure 4 A voltage curve of an alternating current signal according to an embodiment of the present application is shown. According to the foregoing example, the proportion of light flux detected by the photoelectric sensing unit is, for example, 20% at the initial stage of operation of the circular cutting tool. It is easy to understand that when a small notch suddenly appears in the tool, the light flux detected by the photoelectric sensing unit first increases and then decreases when rotating to the photoelectric sensing area at the notch. Therefore, the alternating current signal processed by the alternating current signal processing unit also presents a waveform signal in which the voltage value first increases and then decreases. As shown in the waveform signal in Figure 4 After a period of time, as near T2, when the notch again rotates to the photoelectric sensing area, the same waveform signal is still presented, and the same wave crest voltage can also be reached. According to the embodiment of the present application, the controller can determine whether the use state of the object to be measured can be the damaged state by identifying whether the third digital signal presents the waveform signal.

[0105] However, due to environmental factors or other interference factors, for example, dust or small particles are attached to the edge of the knife, or even larger particles, it can also cause the light flux to present similar changes to the damaged state, that is, the alternating voltage indicated by the third digital signal can also present similar waveform signals. On the one hand, in the case of dust or small particles attached to the edge of the knife, the voltage peak value of the waveform curve presented by the alternating signal is usually smaller than the voltage peak value in the notch state. Therefore, under the premise that the amplification factor of the control amplifier is in the second preset interval, the peak value of the electrical parameter of the alternating signal greater than or equal to the third threshold value can be used as the first condition for judging whether the object to be measured is in the damaged state. On the other hand, in the case of larger impurities such as debris of the object to be measured cut off existing on the edge of the knife, the alternating signal can also present a waveform signal with a larger peak value. However, due to the high-speed rotation of the knife, these attached large particles are easily thrown off by centrifugal motion, for example, a circular cutting knife can throw off the attached large particles after rotating for two weeks. Therefore, under the premise that the amplification factor of the control amplifier is in the second preset interval, the duration of the peak value of the electrical parameter of the alternating signal greater than or equal to the third threshold value greater than the third preset duration can be used as the second condition for judging whether the object to be measured is in the damaged state. The notch state of the circular cutting knife is judged by combining the first condition and the second condition, and the accuracy can reach more than 95%.

[0106] Exemplarily, the initial amplification factor of the second amplifier can be the maximum amplification factor of the amplifier, that is, it can be the maximum value of the above-mentioned second preset interval. For example, in the example in which the aforementioned preset interval is the preset amplification factor (0, 2], the initial amplification factor can be the maximum value of the interval, that is, the amplification factor is 2. And according to the foregoing example, the first preset interval can be the best measurement accuracy interval of the analog-to-digital converter, for example, 5V-9V. The third threshold value is, for example, 7.5V. The third preset duration is, for example, twice the rotation period of the knife, for example, 2T, where T represents the rotation period of the knife. Again, with reference to Figure 4When the controller identifies the presence of a peak in the AC signal, the controller controls the second amplifier to amplify the AC signal by a factor of 2 times the initial amplification factor. The peak voltage of the AC signal before amplification is, for example, 4V, and the peak voltage after amplification is 8V. When the controller identifies the peak, the controller can continue to monitor the AC signal. After a period of 2T, the peak voltage of 8V is still present, and the controller can determine that the circular cutting knife is in a damaged state. In this case, the controller can issue a third prompt in the form of a third prompt sound or a third indicator light. When the user receives the prompt, the user can replace the knife in a timely manner. It is easy to understand that, in this example, the adjustment of the amplification factor of the second amplifier can effectively identify the size of the gap in the damaged state, and can avoid false positives caused by the attachment of small particles or large particles of dust to the edge of the knife. Thus, the accuracy of the use state of the object to be measured determined by the photoelectric detection device can be improved.

[0107] Figure 5 A schematic block diagram of a photoelectric detection device according to another embodiment of the present application is shown. As shown, the photoelectric sensing unit of the photoelectric detection device includes a light sensor 510 and a photoelectric transducer 520. The DC signal processing unit includes a voltage dividing circuit 530 and a first amplifier 540. The AC signal processing unit includes a DC signal filter 550 and a second amplifier 560. The signal post-processing unit includes an analog-to-digital converter 570 and a controller 580.

[0108] It is easy to understand that, Figure 5 The photoelectric detection device shown in FIG. 5 includes two signal processing paths. The first signal processing path is a path formed by the serial electrical connection of the light sensor 510, the photoelectric transducer 520, the voltage dividing circuit 530, the first amplifier 540, the analog-to-digital converter 570, and the controller 580. Since this path can process DC signals, it can be referred to as a DC path. The second signal processing path is a path formed by the serial electrical connection of the light sensor 510, the photoelectric transducer 520, the DC signal filter 550, the second amplifier 560, the analog-to-digital converter 570, and the controller 580, and the direct electrical connection of the controller 580 to the second amplifier 560. Since this path can process AC signals, it can be referred to as an AC path.

[0109] In the direct current path, the light sensor 510 can detect a light signal that is not blocked by the object under test, and can deliver the light signal to the photoelectric converter 520. The photoelectric converter 520 can receive the light signal and convert the light signal into a first electrical signal. The voltage dividing circuit 530 is connected to the photoelectric converter 520, can perform voltage dividing processing on the received first electrical signal, and then amplify the voltage-divided first electrical signal through the first amplifier 530, thereby obtaining a second electrical signal within the measurement range of the analog-to-digital converter 570. The analog-to-digital converter 570 receives the second electrical signal and performs analog-to-digital conversion to obtain a second digital signal. The controller 580 processes the second digital signal to monitor the use state of the object under test. In the example where the object under test is a circular cutting knife, when the controller 580 detects that the electrical parameter of the second digital signal is greater than a first threshold value and less than a second threshold value for at least a first preset time period, it can be determined that the circular cutting knife is in a worn state, and a first prompt information is issued; when the controller 580 detects that the electrical parameter of the second digital signal is greater than the second threshold value for at least a second preset time period, it can be determined that the circular cutting knife is in a total loss state, and a second prompt information is issued.

[0110] In the alternating current path, first, the first electrical signal can be obtained through the light sensor 510 and the photoelectric converter 520. Then, the direct current signal in the first electrical signal can be filtered out through the direct current signal filter 550. The second amplifier 560 is connected to the direct current signal filter 550, can amplify the filtered first electrical signal by an initial amplification factor, for example, by a factor of 2. The amplification factor of the second amplifier 560 can be adjusted within a preset amplification factor range. The analog-to-digital converter 570 is connected to the second amplifier 560, can convert the alternating current signal amplified by the second amplifier 560 into a third digital signal that can be processed by the controller 580 in real time. The controller 580 can process the received third digital signal in real time. Moreover, the controller 580 is also connected to the second amplifier 560, and is further configured to adjust the amplification factor of the second amplifier 560 within the preset amplification factor range based on the previous alternating current signal, so that when the use state of the object under test, for example, the circular cutting knife, is in a damaged state, the electrical parameter of the peak of the alternating current signal is always within the best measurement accuracy range of the analog-to-digital converter 570. At the same time, the controller 580 can also determine that the circular cutting knife is in a damaged state when it detects that the duration for which the electrical parameter of the peak of the alternating current signal is greater than or equal to a third threshold value is greater than a second preset time period.

[0111] Thus, the above-mentioned photoelectric detection device can accurately determine different use state information of the object under test through two different signal processing paths. The device has a simple structure and is easy to implement, and the detection accuracy and efficiency are also high. At the same time, it can greatly save computing resources and reduce device costs, which is conducive to improving the efficiency of industrial production and the yield of products.

[0112] According to another aspect of the present application, there is also provided a photoelectric detection method. Figure 6 A schematic flow chart of a photoelectric detection method according to an embodiment of the present application is shown. As shown, the photoelectric detection method 600 comprises steps S610, S620, S630 and S640. In step S610, a light signal not blocked by a to-be-detected object is acquired and converted into a first electrical signal. In step S620, a first processing operation is performed on the first electrical signal to obtain a second electrical signal. In step S630, the first electrical signal is converted into an alternating current signal. In step S640, a usage state of the to-be-detected object is determined based on the second electrical signal and the alternating current signal. Figure 6

[0113] Exemplarily, step S620 can comprise: performing voltage division processing on the first electrical signal.

[0114] Exemplarily, step S630 can comprise: step S631, filtering out a direct current signal in the first electrical signal to obtain a filtered first electrical signal; and step S632, performing amplification processing on the filtered first electrical signal by using a second amplifier to obtain the alternating current signal, wherein an amplification multiple of the second amplifier is adjustable so that an electrical parameter of a wave crest of the alternating current signal is always within a first preset interval when the usage state of the to-be-detected object is a defective state.

[0115] Exemplarily, step S640 can comprise: step S641, converting the second electrical signal and the alternating current signal into a second digital signal and a third digital signal, respectively; and step S642, determining the usage state of the to-be-detected object based on the second digital signal and / or the third digital signal.

[0116] Exemplarily, the photoelectric detection method 600 can further comprise: step S650, when the electrical parameter of the wave crest of the alternating current signal within a previous third preset time period is greater than a maximum value of the first preset interval, reducing the amplification multiple of the second amplifier; and step S651, when the electrical parameter of the wave crest of the alternating current signal within the previous third preset time period is less than a minimum value of the first preset interval, increasing the amplification multiple of the second amplifier within a second preset interval.

[0117] Exemplarily, the to-be-detected object comprises a circular cutting knife, and the usage state comprises a worn state and a completely worn state, wherein step S640 can comprise: step S643, for a case where the electrical parameter of the second digital signal is greater than a first threshold value and less than a second threshold value within at least a first preset time period, determining that the circular cutting knife is in the worn state; or step S644, for a case where the electrical parameter of the second digital signal is greater than the second threshold value within at least a second preset time period, determining that the circular cutting knife is in the completely worn state.

[0118] ​Exemplarily, the to-be-tested object includes a circular cutting knife, and the use state includes a damaged state. In this case, step S640 can further include: step S645, determining that the to-be-tested object is in the damaged state, if the duration that the electrical parameter of the wave crest of the alternating signal is greater than or equal to the third threshold value is greater than the third preset duration.

[0119] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, components, members, elements, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, components, members, elements, and / or groups thereof.

[0120] It should be noted that the terms "first", "second", and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the present application described herein are capable of operation in other sequences than described or illustrated herein.

[0121] The present application has been described through the above-mentioned embodiments, but it should be understood that the above-mentioned embodiments are only for the purpose of example and illustration, and are not intended to limit the present application to the scope of the described embodiments. Furthermore, those skilled in the art can understand that the present application is not limited to the above-mentioned embodiments, and more various modifications and changes can be made according to the teachings of the present application, and these modifications and changes all fall within the scope of the present application claimed. The scope of protection of the present application is defined by the attached claims and their equivalent scope.

Claims

1. A photodetecting device, characterized by, include: The system comprises a photoelectric sensing unit, a DC signal processing unit, an AC signal processing unit, and a signal post-processing unit, wherein... The photoelectric sensing unit is used to acquire light signals that are not blocked by the object under test, and convert the light signals into a first electrical signal, wherein the object under test is a rotating circular cutting blade; The DC signal processing unit and the AC signal processing unit are connected in parallel between the photoelectric sensing unit and the signal post-processing unit. The DC signal processing unit is used to receive the first electrical signal, perform a first processing operation on the first electrical signal to obtain a second electrical signal, and send the second electrical signal to the signal post-processing unit. The AC signal processing unit is used to receive the first electrical signal, convert the first electrical signal into an AC signal, and send the AC signal to the signal post-processing unit; The signal post-processing unit is used to determine the usage status of the object under test based on the second electrical signal and the AC signal, wherein the usage status indicates whether the object under test is in a normal or abnormal state.

2. The photodetection device of claim 1, wherein The photoelectric sensing unit includes a light sensor and a photoelectric converter connected in series, wherein... The optical sensor is used to detect the optical signal; The photoelectric converter is used to receive the optical signal and convert the optical signal into the first electrical signal.

3. The photodetection device of claim 1, wherein The DC signal processing unit includes a voltage divider circuit, wherein, The voltage divider circuit is used to perform voltage division processing on the first electrical signal.

4. The photodetector device of claim 3, wherein, The DC signal processing unit further includes a first amplifier, wherein, The voltage divider circuit and the first amplifier are connected in series between the photoelectric sensing unit and the signal post-processing unit. The first amplifier is used to amplify the first voltage-divided electrical signal to obtain the second electrical signal.

5. The photodetector device of claim 1, wherein The signal post-processing unit includes an analog-to-digital converter and a controller connected in series, wherein... The analog-to-digital converter is used to receive the second electrical signal and the AC signal, and to convert the second electrical signal and the AC signal into a second digital signal and a third digital signal, respectively. The controller is used to receive the second digital signal and the third digital signal, and determine the usage status of the object under test based on the second digital signal and the third digital signal.

6. The photodetector device according to any one of claims 1 to 5, wherein The AC signal processing unit includes a DC signal filter and a second amplifier connected in series, wherein, The DC signal filter is used to filter out the DC signal in the first electrical signal to obtain the filtered first electrical signal; The second amplifier is used to amplify the filtered first electrical signal to obtain the AC signal, and send the AC signal to the signal post-processing unit. The amplification factor of the second amplifier is adjustable so that when the object under test is in a damaged state, the electrical parameters of the peak of the AC signal are always within a first preset range.

7. The photodetection device of claim 6, when dependent on claim 5, wherein, The controller is connected to the second amplifier, and the controller is further configured to: Based on the previous alternating current signal, the amplification of the second amplifier is changed in a second preset interval, so that when the use state of the object to be measured is a damaged state, the electrical parameter of the wave crest of the alternating current signal is always in the first preset interval, wherein the first preset interval is from the first percentage of the range of the analog-to-digital converter to the second percentage of the range of the analog-to-digital converter.

8. The photoelectric detection device according to any one of claims 1 to 5, wherein The photoelectric sensing unit comprises a light emitting module and a light receiving module, the light emitting module and the light receiving module are arranged on both sides of the edge of the circular cutting knife respectively, the light emitting module is used to emit a light signal, and the light receiving module is used to receive the light signal emitted by the light emitting module and not blocked by the circular cutting knife and convert the received light signal into the first electric signal.

9. The photodetector device of claim 8, wherein, The use state of the circular cutting knife includes a wear state and a total loss state, and the signal post-processing unit determines the use state of the object to be measured based on the second electric signal and the alternating current signal, specifically including the following operations: For the case that the electrical parameter of the second electric signal is greater than the first threshold value and less than the second threshold value for at least a first preset time, it is determined that the circular cutting knife is in a wear state. For the case that the electrical parameter of the second electric signal is greater than the second threshold value for at least a second preset time, it is determined that the circular cutting knife is in a total loss state.

10. The photodetector device of claim 8, wherein, The use state of the circular cutting knife includes a damaged state, and the signal post-processing unit determines the use state of the object to be measured based on the second electric signal and the alternating current signal, specifically including the following operations: For the case that the duration of the electrical parameter of the wave crest of the alternating current signal being greater than or equal to the third threshold value is greater than the third preset time, it is determined that the object to be measured is in the damaged state.

11. A photodetection method, comprising: It includes: Obtaining a light signal not blocked by an object to be measured and converting the light signal into a first electric signal, wherein the object to be measured is a rotating circular cutting knife; Performing a first processing operation on the first electric signal to obtain a direct current second electric signal; Converting the first electric signal into an alternating current signal; and Determining the use state of the object to be measured based on the second electric signal and the alternating current signal, wherein the use state indicates that the object to be measured is in a normal state or an abnormal state.

12. The photodetection method of claim 11, wherein, The first processing operation on the first electric signal to obtain a direct current second electric signal includes: The first electric signal is divided into voltage.

13. The photodetection method of claim 11, wherein, The determination of the use state of the object to be measured based on the second electric signal and the alternating current signal includes: The second electric signal and the alternating current signal are converted into a second digital signal and a third digital signal, respectively; and Determining the use state of the object to be measured based on the second digital signal and the third digital signal.

14. The photodetection method according to any one of claims 11 to 13, wherein, The conversion of the first electric signal into an alternating current signal includes: Filtering out the direct current signal in the first electric signal to obtain a filtered first electric signal; The filtered first electrical signal is amplified by a second amplifier to obtain the alternating current signal, wherein an amplification factor of the second amplifier is adjustable so that an electrical parameter of a wave crest of the alternating current signal is always within a first preset interval when the use state of the object to be measured is a damaged state.

15. The photodetection method of claim 14, wherein, The method further comprises: decreasing the amplification factor of the second amplifier when the electrical parameter of the wave crest of the alternating current signal in a previous third preset time interval is greater than a maximum value of the first preset interval; increasing the amplification factor of the second amplifier within a second preset interval when the electrical parameter of the wave crest of the alternating current signal in the previous third preset time interval is less than a minimum value of the first preset interval.

16. The photodetection method according to any one of claims 11 to 13, wherein, The use state comprises a worn state and a completely worn state, wherein The determination of the use state of the object to be measured based on the second electrical signal and the alternating current signal comprises: determining that the circular cutting knife is in the worn state when the electrical parameter of the second electrical signal is greater than a first threshold value and less than a second threshold value within at least a first preset time interval; determining that the circular cutting knife is in the completely worn state when the electrical parameter of the second electrical signal is greater than the second threshold value within at least a second preset time interval.

17. The photodetection method according to any one of claims 11 to 13, wherein, The use state comprises a damaged state, wherein The determination of the use state of the object to be measured based on the second electrical signal and the alternating current signal comprises: determining that the object to be measured is in the damaged state when a duration in which the electrical parameter of the wave crest of the alternating current signal is greater than or equal to a third threshold value is greater than a third preset time interval.

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