Anti-interference method and system for correlation type photoelectric sensor

Abstract

The invention belongs to the technical field of measurement and detection, and discloses a correlation type photoelectric sensor anti-interference method and system. The method is applied to at least two pairs of correlation type photoelectric sensors which are arranged adjacently, and comprises the following steps: each receiving end converts a received composite optical signal into an electric signal and performs gain amplification to obtain a detection electric signal, and the composite optical signal comprises a pulse optical signal from a corresponding transmitting end and a pulse optical signal from an adjacent transmitting end; the peak voltage of the detection electric signal is compared with a preset threshold voltage, if the peak voltage is smaller than the threshold voltage, a first result is output, if the peak voltage is larger than the threshold voltage, a second result is output, the first result indicates that shielding exists between the transmitting end and the corresponding receiving end, and the second result indicates that no shielding exists between the transmitting end and the corresponding receiving end. The signal detection stability in different shielding states is ensured by dynamically setting the threshold voltage, and the problem of mutual interference when the correlation type photoelectric sensors are installed side by side is effectively solved.

Description

Technical Field

[0001] This application relates to the field of measurement and detection technologies, and particularly to an anti-interference method and system for opposed-type photoelectric sensors. Background Art

[0002] As a core component of automated detection and intelligent control, sensors are widely used in various industrial fields. In particular, the demand for miniaturized, high-precision, and cost-effective sensors is particularly significant. In actual deployments, such sensors often need to face the scenario of being installed side by side, which leads to interference between sensors. To address this challenge, diffuse reflection sensors can utilize their built-in synchronous communication function to avoid such interference. However, for opposed-type photoelectric sensors, since their transmitting end and receiving end are independently designed, the interference problem cannot be solved in the same way.

[0003] To solve the above interference problem, there is a current solution of adding a synchronous line between the transmitting end and the receiving end to achieve synchronous operation, which reduces interference to a certain extent. However, this method increases the wiring complexity and cost. Another method is to reduce the spot size of the light source at the transmitting end, such as using a point light source to reduce the interference range, but this increases the alignment accuracy requirements and the installation difficulty.

[0004] Although the existing solutions can alleviate interference, they also increase the system complexity and installation difficulty. Therefore, a new method that can both reduce interference and facilitate installation is needed. Summary of the Invention

[0005] In view of the above problems, this application provides an anti-interference method and system for opposed-type photoelectric sensors to solve the above technical problems.

[0006] In a first aspect, this application provides an anti-interference method for opposed-type photoelectric sensors, which is applied to at least two pairs of adjacent opposed-type photoelectric sensors. The transmitting end of each pair of opposed-type photoelectric sensors emits a pulsed light signal to the corresponding receiving end, and the light spots of adjacent transmitting ends cross-cover at least a part of the photosensitive area of a non-corresponding receiving end; the anti-interference method for opposed-type photoelectric sensors includes:

[0007] Each receiving end converts the received composite light signal into an electrical signal and performs gain amplification to obtain a detection electrical signal. The composite light signal includes a pulsed light signal from the corresponding transmitting end and a pulsed light signal from an adjacent transmitting end;

[0008] Compare the peak voltage of the detected electrical signal with a preset threshold voltage. If the peak voltage is less than the threshold voltage, output a first result; if the peak voltage is greater than the threshold voltage, output a second result. The first result indicates that there is an occlusion between the transmitting end and the corresponding receiving end, and the second result indicates that there is no occlusion between the transmitting end and the corresponding receiving end.

[0009] Among them, the threshold voltage is dynamically set according to a first peak voltage and a second peak voltage, satisfying: the threshold voltage is less than the first peak voltage and greater than the second peak voltage. The first peak voltage is the peak voltage of the electrical signal obtained by converting the pulsed optical signal of the corresponding transmitting end into an electrical signal and performing gain amplification by the receiving end in an unoccluded state; the second peak voltage is the peak voltage of the electrical signal obtained by converting the pulsed optical signal of an adjacent transmitting end into an electrical signal and performing gain amplification by the receiving end in an unoccluded state.

[0010] In a second aspect, the present application provides an anti-interference system for a transmissive optoelectronic sensor, including:

[0011] At least two pairs of adjacent transmissive optoelectronic sensors. The transmitting end of each pair of transmissive optoelectronic sensors emits a pulsed optical signal to the corresponding receiving end, and the light spots of adjacent transmitting ends cross-cover at least a part of the photosensitive area of a non-corresponding receiving end.

[0012] Among them, the receiving end of each pair of transmissive optoelectronic sensors includes:

[0013] A power conversion module, used to connect to a power supply and convert the power supply voltage into a working voltage to supply power to the receiving end of the transmissive optoelectronic sensor.

[0014] An optoelectronic conversion module, used to convert the received composite optical signal into an electrical signal and perform gain amplification to obtain a detected electrical signal. The composite optical signal includes a pulsed optical signal from the corresponding transmitting end and a pulsed optical signal from an adjacent transmitting end.

[0015] A main control module, used to compare the peak voltage of the detected electrical signal with a preset threshold voltage. If the peak voltage is less than the threshold voltage, output a first signal; if the peak voltage is greater than the threshold voltage, output a second signal. The threshold voltage is dynamically set according to a first peak voltage and a second peak voltage, satisfying: the threshold voltage is less than the first peak voltage and greater than the second peak voltage. The first peak voltage is the peak voltage of the electrical signal obtained by converting the pulsed optical signal of the corresponding transmitting end into an electrical signal and performing gain amplification by the receiving end in an unoccluded state; the second peak voltage is the peak voltage of the electrical signal obtained by converting the pulsed optical signal of an adjacent transmitting end into an electrical signal and performing gain amplification by the receiving end in an unoccluded state.

[0016] An indication module, configured to receive the first signal and display a first result, and receive the second signal and display a second result, where the first result indicates that there is an occlusion between the transmitting end and the corresponding receiving end, and the second result indicates that there is no occlusion between the transmitting end and the corresponding receiving end.

[0017] The anti-interference method and system for a transmissive optoelectronic sensor provided in this application convert the received composite optical signal into an electrical signal at the receiving end and perform gain amplification, and then compare the peak voltage of the detected electrical signal with a preset threshold voltage to determine whether there is an occlusion between the transmitting end and the corresponding receiving end. Among them, the threshold voltage is dynamically set according to the first peak voltage and the second peak voltage, and satisfies that the threshold voltage is less than the first peak voltage and greater than the second peak voltage. Specifically, in the unoccluded state, the peak voltages corresponding to the optical signals from the corresponding transmitting end and the adjacent transmitting end at the same receiving end are different. Therefore, this application dynamically sets the threshold voltage to ensure the signal detection stability in different occlusion states, effectively solving the problem of mutual interference when transmissive optoelectronic sensors are installed side by side. Compared with the existing solutions that reduce interference by adding a synchronization line between the transmitting end and the receiving end or reducing the spot size of the light source at the transmitting end, this application reduces the installation difficulty and wiring difficulty of transmissive optoelectronic sensors while also solving the problem of mutual interference when transmissive optoelectronic sensors are installed side by side.

[0018] These aspects or other aspects of this application will be more clearly understood in the following description of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 Shows an application schematic diagram of the anti-interference method for a transmissive optoelectronic sensor provided in the embodiments of this application.

[0021] Figure 2 Shows a flowchart of the anti-interference method for a transmissive optoelectronic sensor provided in the embodiments of this application.

[0022] Figure 3 Shows a waveform schematic diagram of the composite electrical signal received by the receiving end of the transmissive optoelectronic sensor in the unoccluded state in the embodiments of this application.

[0023] Figure 4 Shows another flowchart of the anti-interference method for a transmissive optoelectronic sensor provided in the embodiments of this application.

[0024] Figure 5 A schematic diagram of a receiving end of a through-beam photoelectric sensor provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0026] In the embodiments of the present application, it should be noted that, in this article, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0027] Moreover, the terms "comprises," "comprising," or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0028] In addition, the "plurality" in the embodiments of the present application refers to two or more than two. In view of this, in the embodiments of the present application, "plurality" can also be understood as "at least two". "At least one" can be understood as one or more, for example, one, two or more. For example, including at least one means including one, two or more, and there is no limit on which ones are included. For example, including at least one of A, B and C, then A, B, C, A and B, A and C, B and C, or A, B and C can be included.

[0029] The embodiment of the present application provides an anti-interference method for an opposed-beam photoelectric sensor, which aims to solve the problem of signal interference between multiple opposed-beam photoelectric sensors arranged adjacent to each other. The embodiment of the present application is applied to at least two pairs of opposed-beam photoelectric sensors arranged adjacent to each other, each pair of opposed-beam photoelectric sensors consists of a transmitting end and a receiving end, and each transmitting end transmits a pulse light signal to the corresponding receiving end. Because multiple opposed-beam photoelectric sensors are installed side by side, the light spots of adjacent transmitting ends will cross-cover part of the photosensitive area of ​​at least one non-corresponding receiving end, thereby causing signal interference.Figure 1 The figure shows an application schematic diagram of the anti-interference method for the transmissive photoelectric sensor provided by the embodiments of the present application. Figure 2 The figure shows a flowchart of the anti-interference method for the transmissive photoelectric sensor provided by the embodiments of the present application. Referring to Figure 1 the application schematic diagram, it shows how this transmissive photoelectric sensor is arranged. And in Figure 2 it, the specific process of this anti-interference method is depicted in detail: As Figure 2 shown, the anti-interference method for the transmissive photoelectric sensor includes:

[0030] Each receiving end converts the received composite optical signal into an electrical signal and performs gain amplification to obtain a detection electrical signal, so as to ensure that even a weak optical signal can be accurately recognized and processed by the receiving end. The composite optical signal includes a pulsed optical signal from the corresponding transmitting end and a pulsed optical signal from an adjacent transmitting end.

[0031] Compare the peak voltage of the detection electrical signal with a preset threshold voltage. If the peak voltage of the detection electrical signal is less than the threshold voltage, output a first result. If the peak voltage is greater than the threshold voltage, output a second result. The first result indicates that there is an occlusion between the transmitting end and the corresponding receiving end, and the second result indicates that there is no occlusion between the transmitting end and the corresponding receiving end.

[0032] Among them, the threshold voltage is dynamically set according to the first peak voltage and the second peak voltage. Specifically, the threshold voltage satisfies the condition that the threshold voltage is less than the first peak voltage and greater than the second peak voltage. Wherein, the first peak voltage is the peak voltage of the electrical signal obtained by converting the pulsed optical signal of the corresponding transmitting end into an electrical signal and performing gain amplification by the receiving end in the unoccluded state; the second peak voltage is the peak voltage of the electrical signal obtained by converting the pulsed optical signal of the adjacent transmitting end into an electrical signal and performing gain amplification by the receiving end in the unoccluded state.

[0033] Optionally, the threshold voltage of the transmissive photoelectric sensor is mainly set to accurately distinguish the signal state, so as to determine whether the receiving end successfully receives the optical signal from the transmitting end, and thus judge whether there is an occluder between the sensors. In the embodiments of the present application, referring to Figure 3 the waveform schematic diagram of the composite electrical signal received by the receiving end in the unoccluded state shown, obviously, the peak voltage of the electrical signal obtained by converting the pulsed optical signal of the corresponding transmitting end into an electrical signal and performing gain amplification by the receiving end in the unoccluded state is significantly greater than the peak voltage of the electrical signal obtained by converting the pulsed optical signal of the adjacent transmitting end into an electrical signal and performing gain amplification by the receiving end in the unoccluded state. In this way, as long as the threshold voltage is set between the two peak voltages, the interference problem of side-by-side installation of the transmissive photoelectric sensors can be stably solved.

[0034] The anti-interference method for the opposed-type photoelectric sensor provided by the embodiment of the present application converts the received composite optical signal into an electrical signal at the receiving end and performs gain amplification, and then compares the peak voltage of the detected electrical signal with a preset threshold voltage to determine whether there is an occlusion between the transmitting end and the corresponding receiving end. The threshold voltage is dynamically set according to the first peak voltage and the second peak voltage, and satisfies that the threshold voltage is less than the first peak voltage and greater than the second peak voltage. Specifically, in the unoccluded state, the peak voltages corresponding to the optical signals from the corresponding transmitting end and the adjacent transmitting end at the same receiving end are different. Therefore, the present application dynamically sets the threshold voltage to ensure the signal detection stability in different occlusion states, effectively solving the problem of mutual interference when the opposed-type photoelectric sensors are installed side by side. Compared with the existing solutions that reduce interference by adding a synchronization line between the transmitting end and the receiving end or by reducing the spot size of the light source at the transmitting end, the present application reduces the installation difficulty and wiring difficulty of the opposed-type photoelectric sensor while solving the problem of mutual interference when the opposed-type photoelectric sensors are installed side by side.

[0035] In some embodiments, Figure 4 Another flowchart of the anti-interference method for the opposed-type photoelectric sensor provided by the embodiment of the present application is shown. As Figure 4 shown, in order to further improve the anti-interference ability and detection accuracy of the opposed-type photoelectric sensor, in the anti-interference method for the opposed-type photoelectric sensor provided by the embodiment of the present application, the step of comparing the peak voltage of the detected electrical signal with a preset threshold voltage further includes:

[0036] Compare the peak voltage of the detected electrical signal with a preset hysteresis voltage. If the peak voltage is greater than the hysteresis voltage, output a second result, where the hysteresis voltage is dynamically set according to the first peak voltage and the threshold voltage and satisfies: the hysteresis voltage is less than the first peak voltage and greater than the threshold voltage. Specifically, if the peak voltage of the detected electrical signal is less than the threshold voltage, it indicates that there is an occlusion between the transmitting end and the receiving end. If the peak voltage of the detected electrical signal is between the threshold voltage and the hysteresis voltage, it indicates that the state of the transmitting end and the receiving end is switched from "unoccluded" to "occluded" or from "occluded" back to "unoccluded". If the peak voltage of the detected electrical signal is greater than the hysteresis voltage, it indicates that there is no occlusion between the transmitting end and the receiving end.

[0037] The anti-interference method for the opposed-type photoelectric sensor provided by the embodiment of the present application effectively prevents false triggering or frequent state switching caused by small-amplitude and instantaneous signal fluctuations by setting the hysteresis voltage. It solves the problem of signal fluctuations that may be caused by environmental changes or slight interference, and can make the sensor more accurate in complex and changeable actual application environments.

[0038] In some embodiments, to ensure the anti-interference ability and detection stability of the transmissive photoelectric sensor, the embodiments of the present application specify the minimum voltage difference between the threshold voltage and the second peak voltage. Specifically, in the anti-interference method for the transmissive photoelectric sensor provided by the embodiments of the present application, the voltage difference between the threshold voltage and the second peak voltage is set to be not less than 50 millivolts.

[0039] In some embodiments, in the anti-interference method for the transmissive photoelectric sensor provided by the embodiments of the present application, the voltage difference between the hysteresis voltage and the threshold voltage is not less than 30 millivolts, so as to reserve enough hysteresis space to prevent false triggering or frequent state switching caused by small-amplitude and instantaneous signal fluctuations.

[0040] In some embodiments, to optimize the performance of the transmissive photoelectric sensor and further reduce the interference between adjacent devices, the embodiments of the present application also specify the specific spacing requirements between adjacent transmissive photoelectric sensors and between the transmitting end and the receiving end of each pair of sensors. In the anti-interference method for the transmissive photoelectric sensor provided by the embodiments of the present application, the spacing between adjacent transmissive photoelectric sensors arranged adjacent to each other is not less than 45 millimeters, and the spacing between the transmitting end and the receiving end of each pair of the transmissive photoelectric sensors does not exceed 20 centimeters. By setting the spacing, the risk of this cross-interference is reduced, thereby improving the reliability and stability of the entire system.

[0041] It can be understood that the anti-interference method for the transmissive photoelectric sensor provided by the embodiments of the present application is implemented in a programming manner at the receiving end. Specifically, the specific algorithms and logical judgments of the anti-interference method for the transmissive photoelectric sensor are encoded and deployed to run on the processor or microcontroller at the receiving end.

[0042] The embodiments of the present application also provide an anti-interference system for a transmissive photoelectric sensor, and the anti-interference system for the transmissive photoelectric sensor includes:

[0043] At least two pairs of adjacent transmissive photoelectric sensors, and the transmitting end of each pair of the transmissive photoelectric sensors emits a pulsed light signal to the corresponding receiving end, and the light spots of adjacent transmitting ends cross-cover at least a part of the photosensitive area of a non-corresponding receiving end.

[0044] Figure 5 The schematic diagram of the receiving end of the transmissive photoelectric sensor provided by the embodiments of the present application is shown, as Figure 5 shown, the receiving end of each pair of transmissive photoelectric sensors includes:

[0045] A power conversion module, which is used to connect to a power supply and convert the power supply voltage into a working voltage to supply power to the receiving end of the transmissive photoelectric sensor. Optionally, the power conversion module is a linear voltage regulator circuit, which is used to linearly step down the input power supply voltage, so as to supply power to the photoelectric conversion module, the main control module and the indication module.

[0046] The photoelectric conversion module is used to convert the received composite optical signal into an electrical signal and perform gain amplification to obtain a detected electrical signal. The composite optical signal includes a pulsed optical signal from the corresponding transmitting end and a pulsed optical signal from an adjacent transmitting end. Optionally, the photoelectric conversion module is a circuit module composed of a photodiode and an operational amplifier circuit, so as to convert the optical signal into an electrical signal and perform multi-stage amplification on the electrical signal.

[0047] The main control module is used to compare the peak voltage of the detected electrical signal with a preset threshold voltage. If the peak voltage is less than the threshold voltage, a first signal is output. If the peak voltage is greater than the threshold voltage, a second signal is output. The threshold voltage is dynamically set according to a first peak voltage and a second peak voltage, satisfying: the threshold voltage is less than the first peak voltage and greater than the second peak voltage. The first peak voltage is the peak voltage of the electrical signal obtained by converting the pulsed optical signal of the corresponding transmitting end into an electrical signal and performing gain amplification at the receiving end in an unobstructed state; the second peak voltage is the peak voltage of the electrical signal obtained by converting the pulsed optical signal of the adjacent transmitting end into an electrical signal and performing gain amplification at the receiving end in an unobstructed state. Optionally, the main control module is a control chip such as a microcontroller / microcontroller / processor, so as to achieve by programming means: comparing the peak voltage of the detected electrical signal with a preset threshold voltage, if the peak voltage is less than the threshold voltage, outputting a first signal, and if the peak voltage is greater than the threshold voltage, outputting a second signal.

[0048] The indication module is used to receive the first signal and display a first result, and receive the second signal and display a second result. The first result indicates that there is an obstruction between the transmitting end and the corresponding receiving end, and the second result indicates that there is no obstruction between the transmitting end and the corresponding receiving end. Optionally, the indication module includes an indicator light and a corresponding protection circuit, so as to indicate the first result / second result by lighting / extinguishing the light.

[0049] It can be understood that the purpose of the embodiments of the present application is to provide an effective anti-interference means to improve the interference problem generated by the side-by-side installation of transmissive photoelectric sensors. Therefore, the specific structures of the modules of the transmitting end and the receiving end of the transmissive photoelectric sensor, such as the power conversion module, the photoelectric conversion module, the main control module, and the indication module, are not limited here.

[0050] In some embodiments, in order to further improve the anti-interference ability and detection accuracy of the transmissive photoelectric sensor, in the anti-interference system of the transmissive photoelectric sensor provided by the embodiments of the present application, the main control module is further configured to compare the peak voltage of the detected electrical signal with a preset hysteresis voltage. If the peak voltage is greater than the hysteresis voltage, a second signal is output. Among them, the hysteresis voltage is dynamically set according to the first peak voltage and the threshold voltage, and satisfies: the hysteresis voltage is less than the first peak voltage and greater than the threshold voltage. Thus, by setting the hysteresis voltage, false triggering or frequent state switching caused by small-amplitude and instantaneous signal fluctuations is effectively prevented. The problem of signal fluctuations that may be caused by environmental changes or slight interference is solved.

[0051] In some embodiments, in the anti-interference system of the transmissive photoelectric sensor provided by the embodiments of the present application, the voltage difference between the threshold voltage and the second peak voltage is not less than 50 millivolts.

[0052] In some embodiments, in the anti-interference system of the transmissive photoelectric sensor provided by the embodiments of the present application, the voltage difference between the hysteresis voltage and the threshold voltage is not less than 30 millivolts.

[0053] In some embodiments, in the anti-interference system of the transmissive photoelectric sensor provided by the embodiments of the present application, the distance between adjacent transmissive photoelectric sensors is not less than 45 millimeters, and the distance between the transmitting end and the receiving end of each pair of transmissive photoelectric sensors does not exceed 20 centimeters.

[0054] The anti-interference system of the transmissive photoelectric sensor provided by the embodiments of the present application converts the received composite optical signal into an electrical signal at the receiving end and performs gain amplification, and then compares the peak voltage of the detected electrical signal with a preset threshold voltage to determine whether there is an occlusion between the transmitting end and the corresponding receiving end. Among them, the threshold voltage is dynamically set according to the first peak voltage and the second peak voltage, and satisfies that the threshold voltage is less than the first peak voltage and greater than the second peak voltage. Specifically, in the unoccluded state, the voltage peaks corresponding to the optical signals from the corresponding transmitting end and the adjacent transmitting end at the same receiving end are different. Therefore, the present application ensures the signal detection stability in different occlusion states by dynamically setting the threshold voltage, effectively solving the problem of mutual interference when transmissive photoelectric sensors are installed side by side. Compared with the existing solutions that reduce interference by adding a synchronization line between the transmitting end and the receiving end or by reducing the spot size of the light source at the transmitting end, the present application reduces the installation difficulty and wiring difficulty of the transmissive photoelectric sensor while also solving the problem of mutual interference when transmissive photoelectric sensors are installed side by side.

[0055] The above content is a further detailed description of the present application in combination with specific implementation manners. It cannot be determined that the specific implementation of the present application is only limited to these descriptions. For those of ordinary skill in the technical field to which the present application pertains, without departing from the concept of the present application, several simple deductions or substitutions can still be made, which should all be regarded as the protection scope of the present application.

Claims

1. A method for anti-interference of a through-beam photoelectric sensor, characterized in that: Applicable to at least two pairs of adjacently arranged opposing photoelectric sensors, wherein the transmitting end of each pair of the opposing photoelectric sensors transmits a pulse light signal to the corresponding receiving end, and the light spots of the adjacent transmitting ends cross-cover a partial photosensitive area of ​​at least one non-corresponding receiving end; The anti-interference method of the through-beam photoelectric sensor comprises: Each receiving end converts the received composite optical signal into an electrical signal and performs gain amplification to obtain a detection electrical signal, wherein the composite optical signal includes a pulse optical signal from a corresponding transmitting end and a pulse optical signal from an adjacent transmitting end; Compare the peak voltage of the detection electrical signal with a preset threshold voltage, and if the peak voltage is less than the threshold voltage, output a first result, and if the peak voltage is greater than the threshold voltage, output a second result, wherein the first result indicates that there is an obstruction between the transmitting end and the corresponding receiving end, and the second result indicates that there is no obstruction between the transmitting end and the corresponding receiving end; Among them, the threshold voltage is dynamically set according to the first peak voltage and the second peak voltage, satisfying: the threshold voltage is less than the first peak voltage and greater than the second peak voltage, the first peak voltage is the peak voltage of the electrical signal obtained by the receiving end converting the pulse light signal of the corresponding transmitting end into an electrical signal and performing gain amplification in an unobstructed state; the second peak voltage is the peak voltage of the electrical signal obtained by the receiving end converting the pulse light signal of the adjacent transmitting end into an electrical signal and performing gain amplification in an unobstructed state.

2. The anti-interference method for a through-beam photoelectric sensor according to claim 1, wherein the step of comparing the peak voltage of the detected electrical signal with a preset threshold voltage further comprises: Comparing the peak voltage of the detection electrical signal with a preset hysteresis voltage, and outputting the second result if the peak voltage is greater than the hysteresis voltage; The hysteresis voltage is dynamically set according to the first peak voltage and the threshold voltage, satisfying that: the hysteresis voltage is less than the first peak voltage and greater than the threshold voltage.

3. The anti-interference method of the through-beam photoelectric sensor according to claim 1, characterized in that: A voltage difference between the threshold voltage and the second peak voltage is not less than 50 mV.

4. The anti-interference method of the through-beam photoelectric sensor according to claim 2, characterized in that: The voltage difference between the hysteresis voltage and the threshold voltage is not less than 30 millivolts.

5. The anti-interference method of a through-beam photoelectric sensor according to claim 1, characterized in that: The spacing between adjacent opposed-beam photoelectric sensors shall not be less than 45 mm, and the spacing between the transmitting end and the receiving end of each pair of opposed-beam photoelectric sensors shall not exceed 20 cm.

6. A through-beam photoelectric sensor anti-interference system, characterized in that: include: At least two pairs of adjacently arranged opposing photoelectric sensors, wherein the transmitting end of each pair of the opposing photoelectric sensors transmits a pulse light signal to the corresponding receiving end, and the light spots of the adjacent transmitting ends cross-cover a partial photosensitive area of ​​at least one non-corresponding receiving end; Wherein, each pair of receiving ends of the said opposed-beam photoelectric sensors comprises: A power conversion module, used to connect to a power source and convert the power voltage into an operating voltage to supply power to a receiving end of the through-beam photoelectric sensor; A photoelectric conversion module, used for converting the received composite optical signal into an electrical signal and performing gain amplification to obtain a detection electrical signal, wherein the composite optical signal includes a pulse optical signal from a corresponding transmitting end and a pulse optical signal from an adjacent transmitting end; A main control module, used for comparing the peak voltage of the detected electrical signal with a preset threshold voltage, and outputting a first signal if the peak voltage is less than the threshold voltage, and outputting a second signal if the peak voltage is greater than the threshold voltage, wherein the threshold voltage is dynamically set according to the first peak voltage and the second peak voltage, and satisfies: the threshold voltage is less than the first peak voltage and greater than the second peak voltage, the first peak voltage being the peak voltage of the electrical signal obtained by the receiving end converting the pulse light signal of the corresponding transmitting end into an electrical signal and performing gain amplification in an unobstructed state; the second peak voltage being the peak voltage of the electrical signal obtained by the receiving end converting the pulse light signal of the adjacent transmitting end into an electrical signal and performing gain amplification in an unobstructed state; The indication module is used to receive the first signal and display a first result, and receive the second signal and display a second result, wherein the first result indicates that there is an obstruction between the transmitting end and the corresponding receiving end, and the second result indicates that there is no obstruction between the transmitting end and the corresponding receiving end.

7. The anti-interference system of the through-beam photoelectric sensor according to claim 6, wherein the main control module is further used to compare the peak voltage of the detection electrical signal with a preset hysteresis voltage, and output the second signal if the peak voltage is greater than the hysteresis voltage; in, The hysteresis voltage is dynamically set according to the first peak voltage and the threshold voltage, satisfying: the hysteresis voltage is less than the first peak voltage and greater than the threshold voltage.

8. The anti-interference system of the through-beam photoelectric sensor according to claim 7, characterized in that: A voltage difference between the threshold voltage and the second peak voltage is not less than 50 mV.

9. The anti-interference system of the through-beam photoelectric sensor according to claim 8, characterized in that: The voltage difference between the hysteresis voltage and the threshold voltage is not less than 30 millivolts.

10. The anti-interference system of the through-beam photoelectric sensor according to claim 7, characterized in that: The distance between adjacent opposed-beam photoelectric sensors shall not be less than 45 mm, and the distance between the transmitting end and the receiving end of each pair of opposed-beam photoelectric sensors shall not exceed 20 cm.

Images