Background suppression photodetector system

Abstract

The application discloses a background suppression type photoelectric sensor system, which comprises a light emitting module, a light receiving module, a voltage amplification module and a gating module. The light emitting module is used for emitting a light signal to a target area in response to a pulse signal. The light receiving module is used for converting a light signal reflected from the target area into a first voltage signal and outputting the first voltage signal. The voltage amplification module is used for amplifying the first voltage signal and generating a second voltage signal. The gating module is used for receiving the pulse signal and the second voltage signal and outputting the second voltage signal when the pulse signal is at a high level. The master control module is used for outputting the pulse signal and receiving the second voltage signal output by the gating module and generating an indication signal according to the second voltage signal. The photoelectric sensor system provided by the application can effectively reduce the influence of stray light on the photoelectric sensor and improve the anti-interference capability of the photoelectric sensor.

Description

Technical Field

[0001] This application relates to the field of sensor technology, specifically to a background suppression type photoelectric sensor system. Background Technology

[0002] Background suppression photoelectric sensors often face the challenge of stray light interference. Because photoelectric sensors receive not only the useful photocurrent generated by their own light source, but also photocurrents from various stray lights in the environment (such as indoor lighting, sunlight, etc.). These stray lights can mix with the useful photocurrent, interfering with the useful optical signal. In some cases, especially when the ambient light intensity is very high, the interference current caused by stray light may even exceed the current generated by the sensor's own light source, directly affecting the normal operation of the photoelectric sensor.

[0003] Traditional background suppression photoelectric sensors typically convert received optical signals directly into electrical signals, then amplify the signals using amplifier circuits before providing them to subsequent circuits for sampling and judgment. However, due to the lack of effective signal separation methods, any interference signals received by the sensor throughout the entire pulse width modulation (PWM) signal cycle can affect the final signal acquisition. Therefore, interference signals may alter the strength of the useful signal, leading to problems such as reduced detection range or misjudgment during sensor operation, and in extreme cases, even causing the sensor to fail to detect the target properly. To overcome these problems, new methods need to be developed to reduce the impact of stray light on the performance of photoelectric sensors. Summary of the Invention

[0004] In view of the above problems, this application provides a background suppression type photoelectric sensor system to solve the above technical problems.

[0005] In a first aspect, this application provides a background suppression type photoelectric sensor system, comprising:

[0006] The optical emission module is used to receive pulse signals and then transmit optical signals to the target area.

[0007] The optical receiving module is used to convert the optical signal reflected from the target area into a first voltage signal output.

[0008] The voltage amplification module is used to amplify the first voltage signal and generate a second voltage signal output.

[0009] The gating module is used to receive pulse signals and second voltage signals, and outputs the second voltage signal when the pulse signal is high.

[0010] The main control module is used to output pulse signals and receive the second voltage signal output by the gating module. It generates an indication signal based on the second voltage signal, which is used to indicate whether a target object is present in the target area.

[0011] The background suppression photoelectric sensor system provided in this application receives a pulse signal and generates a second voltage signal through a voltage amplification module. The second voltage signal is only output to the main control module when the pulse signal is high. In this way, the main control module will only determine whether there is a target object in the target area when the pulse signal is high, which effectively reduces the influence of stray light on the photoelectric sensor and improves the anti-interference capability of the photoelectric sensor.

[0012] These or other aspects of this application will become more apparent in the following description of the embodiments. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 A schematic diagram of the photoelectric sensor system provided in an embodiment of this application is shown.

[0015] Figure 2 A schematic diagram of a gating module provided in an embodiment of this application is shown.

[0016] Figure 3 This paper shows another structural schematic diagram of the analog switch unit provided in an embodiment of this application.

[0017] Figure 4 A schematic diagram of the optical emission module provided in an embodiment of this application is shown.

[0018] Figure 5 A schematic diagram of a light emitting module provided in an embodiment of this application is shown.

[0019] Figure 6 A schematic diagram of the optical receiving module provided in an embodiment of this application is shown.

[0020] Figure 7 A schematic diagram of a structure of an optical receiving module provided in an embodiment of this application is shown.

[0021] Figure 8 A schematic diagram of the voltage amplification module provided in an embodiment of this application is shown.

[0022] Figure 9 A schematic diagram of a voltage amplification module provided in an embodiment of this application is shown.

[0023] Figure 10 This paper illustrates another module diagram of the photoelectric sensor system provided in an embodiment of this application.

[0024] Figure 11 A schematic diagram of a power conversion module provided in an embodiment of this application is shown.

[0025] Figure 12 This illustration shows another module schematic of the photoelectric sensor system provided in an embodiment of this application.

[0026] Figure 13 A schematic diagram of the photoelectric sensor provided in an embodiment of this application is shown. Detailed Implementation

[0027] To enable those skilled in the art to better understand the solutions of this application, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0028] In the embodiments of this application, it should be noted that, in this document, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0029] Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0030] It should be noted that in the embodiments of this application, "connection" can be understood as electrical connection. The connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components.

[0031] In the circuit structure provided by the embodiments of this application, nodes do not represent actual existing components, but rather represent the junctions of related couplings in the circuit diagram. In other words, these nodes are equivalent to the junctions of related couplings in the circuit diagram.

[0032] In the embodiments of this application, the first terminal of each transistor is one of the collector and the emitter, and the second terminal of each transistor is the other of the collector and the emitter. Since the collector and emitter of a transistor can be symmetrical in structure, they can be indistinguishable in structure. That is to say, the first terminal and the second terminal of the transistor in the embodiments of this application can be indistinguishable in structure.

[0033] This application provides a background suppression type photoelectric sensor system. Figure 1 A schematic diagram of the photoelectric sensor system provided in an embodiment of this application is shown, such as... Figure 1 As shown, the photoelectric sensor system includes a light emitting module, a light receiving module, a voltage amplification module, a gating module, and a main control module.

[0034] The system includes a light emitting module for receiving pulse signals to emit light signals towards the target area, a light receiving module for converting the light signals reflected from the target area into a first voltage signal for output, a voltage amplification module for amplifying the first voltage signal and generating a second voltage signal for output, a gating module for receiving the pulse signal and the second voltage signal, and outputting the second voltage signal when the pulse signal is high, and a main control module for outputting the pulse signal and receiving the second voltage signal output by the gating module, and generating an indication signal based on the second voltage signal. The indication signal is used to indicate whether a target object exists in the target area. Optionally, when there are interfering light sources, the light receiving module may also receive light signals from the interfering light sources. These interfering light sources may cause the useful signal (the light signal from the target area) to rise or fall, and in severe cases, may even drown out the useful signal, leading to false detection by the sensor. Therefore, this embodiment of the application includes a gating module, so that the electrical signal converted by the light receiving module will only be received by the main control module when the pulse signal output by the main control module is high, in order to reduce the interference of interfering light sources on the sensor.

[0035] It is understood that in the embodiments of this application, the main control module is a chip with central processing unit capabilities. When the main control module transmits different signals with other modules, it is connected to each module through different I / O ports. For example, the main control module can be an MCU (microcontroller), a single-chip microcomputer, etc.

[0036] The background suppression type photoelectric sensor system provided in this application embodiment receives a pulse signal and generates a second voltage signal through a voltage amplification module. The second voltage signal is only output to the main control module when the pulse signal is high. In this way, the main control module will only determine whether there is a target object in the target area when the pulse signal is high, which effectively reduces the influence of stray light on the photoelectric sensor and improves the anti-interference capability of the photoelectric sensor.

[0037] In some embodiments, Figure 2 This paper illustrates a structural diagram of a gating module provided in an embodiment of this application, as shown below. Figure 2 As shown, in the photoelectric sensor system provided in this application embodiment, the gating module includes an analog switch unit. The signal input terminal (A) of the analog switch unit is connected to the voltage amplification module to receive the second voltage signal output by the voltage amplification module. The first signal output terminal (B1) of the analog switch unit is connected to the main control module to output the second voltage signal to the main control module, so that the main control module can determine whether there is a target detection object in the target area based on the second voltage signal. The second signal output terminal (B2) of the analog switch unit is grounded, so that when the pulse signal is low, the second voltage signal is discharged to the ground to avoid interference from the light source. The control terminal (SELECT) of the analog switch unit is connected to the main control module to receive the pulse signal output by the main control module, so that the analog switch unit controls the second voltage signal to be output from the first signal output terminal when the pulse signal is high, and controls the second voltage signal to be output from the second signal output terminal when the pulse signal is low.

[0038] Optionally, the analog switch unit also includes a power input terminal and a ground terminal, for connecting the power supply circuit and ground of the photoelectric sensor system, respectively.

[0039] It is understood that no restrictions are placed on the specific structure of the analog switch unit in this embodiment. For example, the analog switch unit can be set as an existing analog switch device / chip, or it can be set as a circuit with selection capability built by the designer. Specifically, the analog switch unit can be any circuit module that can achieve the functions described in the above embodiments.

[0040] The background suppression type photoelectric sensor system provided in this application provides a second voltage signal output to the main control module through an analog switch unit. The analog switch unit will only select to output the second voltage signal to the main control module when the pulse signal is high. In this way, the main control module will only determine whether there is a target object in the target area when the pulse signal is high, which effectively reduces the influence of stray light on the photoelectric sensor and improves the anti-interference capability of the photoelectric sensor.

[0041] In some embodiments, Figure 3This paper illustrates another structural schematic diagram of the analog switching unit provided in an embodiment of this application, as shown below. Figure 3 As shown, the analog switch unit also includes a first resistor R1. The first end of the first resistor R1 is connected to the second signal output terminal (B2) of the analog switch unit, and the second end of the first resistor unit is grounded. Optionally, the first resistor R1 is used as a pull-down resistor to pull down and discharge the interference signal integrated by the interference light to ground when the pulse signal is low, thereby avoiding interference with the useful signal.

[0042] In some embodiments, Figure 4 A schematic diagram of the optical emitting module provided in an embodiment of this application is shown, as follows: Figure 4 As shown, the optical emission module includes a laser diode LD, a photodiode PD, a first filter unit, a first switch unit, a second switch unit, a first voltage divider unit, a second voltage divider unit, a power adjustment unit, a first current limiting unit, and an anti-reverse diode unit D1.

[0043] The anode of the laser diode LD receives the supply voltage V5P0 through the first filter unit, and the cathode is connected to the first switching unit through the first current limiting unit. The cathode of the photodiode PD receives the supply voltage V5P0 through the first filter unit, and the anode is connected to the second switching unit. The control terminal of the first switching unit is connected to the second switching unit and to the main control module through the first voltage divider unit to receive pulse signals. The first terminal is connected to the laser diode LD through the first current limiting unit, and the second terminal is grounded. The control terminal of the second switching unit is connected to the anode of the photodiode and to the power adjustment unit through the second voltage divider unit. The first terminal is connected to the first switching unit, and the second terminal is grounded. The power adjustment unit is used to adjust the voltage division output from the second voltage divider unit to the second switching unit. The anode of the anti-reverse diode unit D1 is connected to the second switching unit through the first current limiting unit, and the cathode of the anti-reverse diode unit D1 receives the supply voltage V5P0 through the first filter unit. The power adjustment unit, the first filter unit, the first voltage divider unit, and the second voltage divider unit are also grounded.

[0044] The first filter unit is used to filter the power supply voltage V5P0, the first voltage divider unit and the second voltage divider unit are used to provide bias voltages for the first switch unit and the second switch unit respectively, the first current limiting unit is used to limit the current, and the anti-reverse diode unit is used to prevent the current from reversing.

[0045] Optionally, in the background suppression type photoelectric sensor system provided in this application embodiment, when the pulse signal output by the main control module is low, the first switching unit is not turned on, so the laser diode does not emit light; when the pulse signal output by the main control module is high, the first switching unit is turned on, so the laser diode emits light. Optionally, after the first switching unit is turned on, the greater the luminous power of the laser diode, the greater the photocurrent of the photodiode. When the photocurrent reaches a threshold, the second switching unit is turned on, thereby reducing the luminous power of the laser diode. When the luminous power of the laser diode decreases, the second switching unit is turned off, allowing the luminous power of the laser diode to increase again. The photoelectric sensor system provided in this application embodiment keeps the optical power in a dynamic equilibrium state.

[0046] It is understood that the embodiments of this application do not limit the specific structure of the first filtering unit, the first voltage divider unit, the second voltage divider unit, the power adjustment unit, and the first current limiting unit, as long as they can achieve the functions described in the above embodiments.

[0047] In some embodiments, Figure 5 This paper illustrates a schematic diagram of a light emitting module provided in an embodiment of this application, as shown below. Figure 5 As shown, the first switching unit includes an NPN transistor Q1, and the second switching unit includes an NPN transistor Q2. The first current-limiting unit includes a resistor RL, whose first terminal is connected to the cathode of the laser diode LD and the anode of the anti-reverse diode D1, respectively, and whose second terminal is connected to the first terminal of the first switching unit. The first voltage divider unit includes a second resistor R2 and a third resistor R3. The first terminal of the second resistor R2 is connected to the main control module to receive pulse signals, and its second terminal is connected to both the first switching unit and the first terminal of the third resistor R3. The second terminal of the third resistor R3 is grounded. The second voltage divider unit includes a fourth resistor R4 and a fifth resistor R5. The first terminal of the fourth resistor R4 is connected to the second switching unit, and its second terminal is connected to both the power adjustment unit and the first terminal of the fifth resistor R5, respectively. The second terminal of the fifth resistor is grounded. The power adjustment unit includes a potentiometer RT, whose sliding terminal is connected to both the fourth resistor R4 and the fifth resistor R5, with its first terminal floating and its second terminal grounded. The first filter unit includes a sixth resistor R6, a first capacitor C1, and a second capacitor C2. The first end of the sixth resistor R6 is used to receive the power supply voltage V5P0. The second end of the sixth resistor R6 is connected to the first end of the first capacitor C1, the first end of the second capacitor C2, the laser diode LD, and the photodiode PD, respectively. The second ends of the first capacitor C1 and the second ends of the second capacitor C2 are both grounded.

[0048] The photoelectric sensor system provided in this application embodiment achieves dynamic control of the power of the laser diode using only two switching units and basic components such as resistors and capacitors. Compared with the traditional laser driving circuit, which requires the use of operational amplifiers and transistors to achieve dynamic control of the laser diode, the photoelectric sensor provided in this application embodiment reduces the circuit cost.

[0049] In some embodiments, Figure 6 A schematic diagram of the optical receiving module provided in an embodiment of this application is shown, as follows: Figure 6 As shown, the optical receiving module includes a dual photodiode unit U1, a second filtering unit, a first sampling unit, and a second sampling unit. The two cathodes of the dual photodiode unit U1 are used to receive the supply voltage V5P0 through the second filtering unit, and the two anodes are connected to a voltage amplification module and grounded through the first and second sampling units respectively. This allows the dual photodiode unit to convert the light signal reflected from the target area into two electrical signals (i.e., the first voltage signal).

[0050] It is understood that the embodiments of this application do not limit the specific structure of the second filtering unit, the first sampling unit and the second sampling unit, as long as they can achieve the functions described in the embodiments above.

[0051] For example, Figure 7 This application provides a schematic diagram of the structure of an optical receiving module according to an embodiment of the present application. Figure 7 As shown, the second filtering unit is an RC filter circuit composed of the seventh resistor R7 and the third capacitor C3, the first sampling unit includes the eighth resistor R8, and the second sampling unit includes the ninth resistor R9.

[0052] In some embodiments, Figure 8 A schematic diagram of the voltage amplification module provided in an embodiment of this application is shown, as follows: Figure 8 As shown, the voltage amplification module includes a third filtering unit, a differential amplification unit, a fourth filtering unit, and an inverting amplification unit. The third filtering unit is used to receive the first voltage signal (the first voltage signal is...). Figure 6 The two electrical signals output by the optical receiving module shown are used to filter the first voltage signal, and the differential amplifier unit is used to process the filtered first voltage signal (the first voltage signal is...). Figure 6 The two electrical signals output by the optical receiving module are differentially amplified to generate a third voltage signal output; the fourth filtering unit is used to filter the third voltage signal, and the inverting amplification unit is used to invert and amplify the filtered third voltage signal to generate a second voltage signal output.

[0053] The photoelectric sensor system provided in this application embodiment uses a differential amplification unit to amplify the two electrical signals (i.e., the first voltage signal) converted by the light receiving module to generate a third voltage signal using a first-stage differential method. Then, an inverting amplification unit amplifies the third voltage signal obtained after the first-stage amplification to generate a second voltage signal using a second-stage inverting amplification. In this way, even if the amount of reflectance of the detection object of different colors is different, resulting in different photocurrents generated by the photodiode, the two electrical signals generated by the dual photodiode unit will increase or decrease simultaneously. This prevents the sensor from changing the detection distance due to the varying reflectance of the test object of different colors, thereby achieving a background suppression effect.

[0054] It is understood that the embodiments of this application do not limit the specific structure of the differential amplification unit and the inverting amplification unit described above, as long as they can achieve the functions described in the embodiments above.

[0055] For example, Figure 9 This paper illustrates a structural schematic diagram of a voltage amplification module provided in an embodiment of this application, as shown below. Figure 9 As shown, the voltage amplification module (referring to...) Figure 9 In the circuit within the dashed line, the third filtering unit includes a fourth capacitor C4 and a fifth capacitor C5 connected to the two anodes of the dual photodiode unit in the optical receiving module, to filter the two received electrical signals (i.e., the first electrical signal) respectively. The inverting differential amplifier unit includes a first operational amplifier A1, a sixth capacitor C6, a seventh capacitor C7, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, and a fifteenth resistor R15.

[0056] The inverting input of the first operational amplifier A1 is connected to one anode of the dual photodiode unit via the tenth resistor R10 and the fourth capacitor C4, and is connected to the output of the first operational amplifier A1 via the eleventh resistor R11. The non-inverting input of the first operational amplifier A1 is connected to the other anode of the dual photodiode unit via the fifth capacitor C5, and is grounded via the twelfth resistor R12 and the sixth capacitor C6. The connection point between the sixth capacitor C6 and the twelfth resistor R12 is also grounded via the fourteenth resistor R14 and the fifteenth resistor R15. The ground terminal of the first operational amplifier A1 is grounded. The power supply terminal of the first operational amplifier A1 receives the supply voltage V5P0 and is grounded via the seventh capacitor C7. The seventh capacitor C7 is also grounded via the thirteenth resistor R13, the fourteenth resistor R14, and the fifteenth resistor R15. The output of the first operational amplifier A1 is connected to the inverting amplifier unit.

[0057] The fourth filtering unit includes an eighth capacitor C8 to filter the third voltage signal output by the differential amplifier unit. The inverting amplifier unit includes a second operational amplifier A2, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a sixteenth resistor R16, a seventeenth resistor R17, and an eighteenth resistor R18.

[0058] The inverting input of the second operational amplifier A2 is connected to the output of the first operational amplifier A1 through the sixteenth resistor R16 and the eighth capacitor C8, and is connected to the output of the second operational amplifier A2 through the ninth capacitor C9 and the seventeenth resistor R17. The non-inverting input of the second operational amplifier A2 is grounded through the tenth capacitor C10. The output of the second operational amplifier is connected to the signal input (A) of the gating module through the eighteenth resistor R18, and is grounded through the eleventh capacitor C11.

[0059] In some embodiments, Figure 10 This application provides another schematic diagram of a photoelectric sensor system module, as shown in the embodiment. Figure 10 As shown, the photoelectric sensor system also includes a power conversion module for connecting to a power supply and stepping down the power supply voltage to convert it into a supply voltage V5P0, which supplies power to the light emitting module, light receiving module, voltage amplification module, gating module, and main control module respectively.

[0060] It is understood that the embodiments of this application do not limit the specific structure of the power conversion module described above, as long as it can achieve the functions described in the above embodiments. For example, the power conversion module can achieve power step-down by using a step-down chip.

[0061] In some embodiments, the power conversion module provided in this application is a digital sensor output driver that integrates a low-dropout linear regulator. In addition to stepping down the power supply voltage to power each module, the digital sensor output driver that integrates a low-dropout linear regulator can also receive a first-level signal and a second-level signal output from two I / O ports of the main control module. When the first-level signal and the second-level signal are high, it outputs an NPN signal. When the first-level signal is high and the second-level signal is low, it outputs a PNP signal.

[0062] Optionally, taking the TIOS1015DMWR digital sensor output driver as an example, Figure 11 A schematic diagram of a power conversion module provided in an embodiment of this application is shown, such as... Figure 11As shown, this model of digital sensor output driver integrates a low dropout linear regulator. The VCC pin is configured to receive the power supply voltage Vin through the current-limiting resistor R19 and is also grounded through the filter capacitor C12. The VCC_IN / OUT pin is configured to output the power supply voltage V5P0 (i.e., convert the power supply voltage to a 5V supply voltage) and is grounded through the capacitor C13, thereby realizing the step-down of the power supply voltage Vin to the supply voltage V5P0 to power each module.

[0063] like Figure 11 As shown, in the TIOS1015DMWR digital sensor output driver, the IN and EN pins are configured to connect to the main control module to receive a first-level signal and a second-level signal, respectively. Based on the first and second-level signals, the OUT pin outputs an NPN signal and a PNP signal, thus configuring the digital sensor output driver to output either an NPN or PNP signal. Specifically, this model of digital sensor output driver includes two customizable I / O ports (IN and EN pins), which are configured to receive a first-level signal and a second-level signal from the main control module (such as an MCU, microcontroller, etc.). When the first and second-level signals are high, the digital sensor output driver outputs an NPN signal through the OUT pin; when the first-level signal is high and the second-level signal is low, the digital sensor output driver outputs a PNP signal through the OUT pin. It should be understood that the first and second relational terms in this embodiment are merely used to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0064] It is understandable that, such as Figure 11 As shown, the power conversion module provided in this application embodiment only utilizes the pins described in the above embodiments, and this application embodiment does not limit other pins of the TIOS1015DMWR digital sensor output driver. The pin connection relationships can be set according to requirements during circuit design. For example, as... Figure 11As shown, in the TIOS1015DMWR digital sensor output driver, this embodiment configures the NFAULT pin (typically used by the TIOS1015DMWR digital sensor output driver to indicate the driver's fault status) to be grounded through current-limiting resistor R20, configures the ILIM_ADJ pin (typically used by the TIOS1015DMWR digital sensor output driver to adjust or set the driver's maximum output current limit) to be grounded through current-limiting resistor R21, configures the NC0 pin (an undefined pin) to be unconnected, configures the NC1 pin (an undefined pin) to be grounded, and configures the GND pin to be grounded.

[0065] In some embodiments, Figure 12 This application shows another schematic diagram of a photoelectric sensor system module provided in an embodiment of the present application, such as... Figure 12 As shown, the photoelectric sensor system also includes an indication module connected to the main control module, used to receive the indication signal, indicating the presence of the target detection object in the target area when the indication signal is at a first level, and indicating the absence of the target detection object in the target area when the indication signal is at a second level.

[0066] It is understood that the specific structure of the above-mentioned indicator module is not limited in the embodiments of this application, as long as it can achieve the functions described in the above embodiments. For example, the indicator module can be set to indicate by light, or the indicator module can also be set to indicate by sound.

[0067] The background suppression photoelectric sensor system provided in this application embodiment is used in the fabrication of a background suppression photoelectric sensor. Optionally, this application embodiment provides a background suppression photoelectric sensor. Figure 13 A schematic diagram of the photoelectric sensor provided in an embodiment of this application is shown, as follows: Figure 13 As shown, the photoelectric sensor includes a housing 100 and a photoelectric sensor system, a transmitting lens 110, and a receiving lens 120 disposed within the housing 100.

[0068] In some embodiments, the background suppression photoelectric sensor system provided in this application is used to fabricate a laser background suppression photoelectric sensor.

[0069] The above description, in conjunction with specific embodiments, provides a further detailed explanation of this application and should not be construed as limiting the specific implementation of this application to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of this application, and all such modifications and substitutions should be considered within the scope of protection of this application.

Claims

1. A background suppression photodetector system characterized by, The application relates to a target detection device. The application relates to a target detection device. The application relates to a target detection device. The application relates to a target detection device. The application relates to a target detection device. The application relates to a target detection device. The application relates to a target detection device. The application relates to a target detection device. The application relates to a target detection device. The application relates to a target detection device. The application relates to a target detection device. The application relates to a target detection device. The application relates to a target detection device. The application relates to a target detection device.

2. The background suppression photodetector system of claim 1, wherein, The application relates to a target detection device. The application relates to a target detection device. The application relates to a target detection device. The application relates to a target detection device.

3. The background suppression photodetector system of claim 2, wherein, The application relates to a target detection device. The application relates to a target detection device.

4. The background suppression phototransducer system of claim 1, wherein, The application relates to a target detection device. The application relates to a target detection device. The application relates to a target detection device. The application relates to a target detection device. The application relates to a target detection device. The application relates to a target detection device. The application relates to a target detection device. The application relates to a target detection device. The application relates to a target detection device. The application relates to a target detection device. The application relates to a target detection device. The application relates to a target detection device. The application relates to a target detection device. The application relates to a target detection device. The application relates to a target detection device. The application relates to a target detection device. The application relates to a target detection device. 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The application relates to a The first end of the second resistor is connected to the main control module to receive the pulse signal, the second end of the second resistor is connected to the first switch unit and the first end of the third resistor respectively, and the second end of the third resistor is grounded; The second voltage divider unit includes a fourth resistor and a fifth resistor; The first end of the fourth resistor is connected to the second switching unit, the second end of the fourth resistor is connected to the power adjustment unit and the first end of the fifth resistor respectively, and the second end of the fifth resistor is grounded; The power adjustment unit includes a potentiometer; The sliding terminal of the potentiometer is connected to the fourth resistor and the fifth resistor respectively, with the first terminal floating and the second terminal grounded; The first filter unit includes a sixth resistor, a first capacitor, and a second capacitor; The first end of the sixth resistor is used to receive the power supply voltage, and the second end of the sixth resistor is connected to the first end of the first capacitor, the first end of the second capacitor, the laser diode and the photodiode respectively. The second ends of the first capacitor and the second end of the second capacitor are both grounded.

5. The background suppression phototransducer system of claim 1, wherein, The optical receiving module includes a dual photodiode unit, a second filtering unit, a first sampling unit, and a second sampling unit. Both cathodes of the dual photodiode unit are used to receive the power supply voltage through the second filter unit, and the two anodes are connected to the voltage amplification module and grounded through the first sampling unit and the second sampling unit, respectively.

6. The background suppression phototransducer system of claim 1, wherein, The voltage amplification module includes: The third filtering unit is used to receive the first voltage signal and perform filtering processing on the first voltage signal; A differential amplifier unit, connected to the third filter unit, is used to differentially amplify the first voltage signal to generate a third voltage signal output. The fourth filtering unit is used to receive the third voltage signal and filter the third voltage signal; An inverting amplifier unit, connected to the fourth filtering unit, is used to invert and amplify the second voltage signal to generate the second voltage signal output.

7. The background suppression phototransducer system of claim 1, wherein, Also includes: The power conversion module is used to connect to the power supply and step down the power supply voltage to convert it into a supply voltage to power the optical transmitting module, optical receiving module, voltage amplification module, gating module and main control module respectively.

8. The background suppression phototransducer system of claim 7, wherein, The power conversion module includes a digital sensor output driver with an integrated low-dropout linear regulator. The digital sensor output driver with the integrated low-dropout linear regulator is also used to receive a first level signal and a second level signal output by the main control module. When both the first level signal and the second level signal are high, it outputs an NPN signal. When the first level signal is high and the second level signal is low, it outputs a PNP signal.

9. The background suppression phototransducer system of claim 1, wherein, Also includes: An indicator module, connected to the main control module, is used to receive the indicator signal, indicating the presence of the target detection object in the target area when the indicator signal is at a first level, and indicating the absence of the target detection object in the target area when the indicator signal is at a second level.

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