An Adaptive Adjustment Photoelectric Detection Circuit and Method Applied to Fiber Lasers

Abstract

The present invention discloses an adaptive adjustment optoelectronic detection circuit and method applied to a fiber laser, which relates to the field of optoelectronic detection. The adaptive adjustment optoelectronic detection circuit includes an optoelectronic detection circuit, an MCU, and a memory; the optoelectronic detection circuit is placed at the optical path monitoring point of the fiber laser; the MCU sets a given value output by the optoelectronic detection circuit according to the light output gear of the fiber laser; the ADC module inside the MCU samples the actual output value of the optoelectronic detection circuit, adjusts the resistance value of the variable resistor through the PI control algorithm until the actual output value reaches the given value, and writes the resistance value of the variable resistor at this time into the memory; when the fiber laser is in use, the MCU reads the corresponding saved resistance value in the memory according to the current light output gear and adjusts the resistance value of the variable resistor to be consistent with the saved resistance value. The present invention uses a variable resistor to replace a fixed-resistance resistor, dynamically adjusts the resistance value of the variable resistor through the MCU, eliminates the need for manual replacement, reduces the workload in the debugging process and the risk of damage to the fiber laser.

Description

Technical Field

[0001] The present invention relates to the field of photoelectric detection technology, and in particular to an adaptive adjustment photoelectric detection circuit and method applied to a fiber laser. Background Art

[0002] In recent years, as the power of fiber lasers has gradually increased, the risk of fiber laser burnout has also increased, so the requirements for its reliability have gradually increased. The current response method is usually to place a photoelectric (PD) detection circuit at the main optical path monitoring point of the fiber laser to detect whether the laser is abnormal, which can achieve effective and timely protection of the laser and improve the reliability of the laser. Specifically, the PD detection circuit is used to detect the optical fiber leakage scattered light, and the abnormal changes in the scattered light intensity are analyzed. The output of the PD detection circuit is connected to the ADC module of the MCU for data reading to determine whether the data is within the normal expected threshold range, thereby determining whether the laser output is abnormal. If there is an abnormality, the pump (LD) power supply is turned off in time to quickly protect the laser in a very short time to prevent large-scale burning of the main optical path.

[0003] In fiber laser applications, PD detection circuits need to be placed at multiple locations in the optical path for light intensity detection, which are mainly divided into power monitoring PD detection circuits and return light monitoring PD detection circuits. The PD detection circuit is placed at different locations, and the detected light intensity is different. Different feedback resistors need to be selected for adjustment so that the output voltage of the PD detection circuit is within the range of 0V-FV (F is the saturation value of ADC). Since the size of the detected light intensity is unknown, in actual debugging, the feedback resistor needs to be manually replaced according to the ADC reading.

[0004] Specifically, for fiber lasers of different powers and wavelengths, the power monitoring PD detection circuit will have different light leakage depending on its placement and output power, resulting in differences in PD feedback resistance between different lasers; for the return light monitoring PD detection circuit, the laser wavelengths are different, and the difference in the return light intensity is large, which will cause differences in the resistance of the PD feedback resistance between different lasers. Even for lasers with the same power and the same placement position, the light leakage is different due to the difference in fiber process consistency, resulting in differences in the resistance of the PD feedback resistance. Furthermore, based on the power monitoring PD detection circuit of the same fiber laser, the PD detection range is wide, from weak light to full-power strong light. If a fixed resistance value is selected for its feedback resistor, it will inevitably lead to a small ADC reading during weak light detection, and a reading close to the ADC saturation value during full-power strong light detection, resulting in an inaccurate ADC reading and prone to false protection.

[0005] Therefore, due to the influence of many factors, the existing PD fixed-value feedback resistor technology is prone to the situation of frequently replacing the PD feedback resistor according to different light intensities during the batch development of lasers, resulting in a large amount of PD debugging work during the development of lasers. During the process of replacing the feedback resistor multiple times, the risk of damaging the optical fiber and adjacent optical devices will also increase. Summary of the Invention

[0006] The purpose of the present invention is to provide an adaptive adjustment photoelectric detection circuit and method applied to a fiber laser, which uses a variable resistor to replace a fixed-value resistor, and dynamically adjusts the resistance value of the variable resistor through an MCU, without manual replacement, reducing the workload during the debugging process and the risk of damage to the fiber laser.

[0007] To achieve the above purpose, the present invention provides the following solutions:

[0008] In some embodiments, the present invention provides an adaptive adjustment photoelectric detection circuit applied to a fiber laser, including: a photoelectric detection circuit, an MCU, and a memory; the photoelectric detection circuit is placed at the optical path monitoring point of the fiber laser; the photoelectric detection circuit includes a photodiode D1, a transimpedance amplifier, and a proportional amplifier; the proportional amplifier includes an operational amplifier U2, a resistor R1, and a variable resistor R2;

[0009] The positive electrode of the photodiode D1 is connected to the input end of the transimpedance amplifier; the negative electrode of the photodiode D1 is connected to the power supply VCC; the output end of the transimpedance amplifier is connected to one end of the resistor R1; the other end of the resistor R1 is respectively connected to the first fixed contact of the variable resistor R2 and the inverting input end of the operational amplifier U2; the non-inverting input end of the operational amplifier U2 is grounded; the output end of the operational amplifier U2 is respectively connected to the second fixed contact of the variable resistor R2 and the ADC module of the MCU; the MCU is also respectively communicatively connected to the adjustable contact of the variable resistor R2 and the memory.

[0010] Optionally, the transimpedance amplifier includes an operational amplifier U1, a resistor RF, and a capacitor CF; the inverting input end of the operational amplifier U1 is respectively connected to the positive electrode of the photodiode D1, one end of the resistor RF, and one end of the capacitor CF; the non-inverting input end of the operational amplifier U1 is grounded; the output end of the operational amplifier U1, the other end of the resistor RF, and the other end of the capacitor CF are all connected to one end of the resistor R1.

[0011] Optionally, the variable resistor R2 uses a digital potentiometer.

[0012] Accordingly, the present invention further provides an adaptive adjustment optoelectronic detection method applied to a fiber laser, which is applied to the above-mentioned adaptive adjustment optoelectronic detection circuit. The adaptive adjustment optoelectronic detection method includes:

[0013] The MCU sets a given value output by the optoelectronic detection circuit according to the light output level of the fiber laser.

[0014] The ADC module inside the MCU samples the actual output value of the optoelectronic detection circuit, adjusts the resistance value of the variable resistor R2 through a PI control algorithm until the actual output value reaches the given value, and writes the resistance value of the variable resistor R2 at this time into the memory.

[0015] When the fiber laser is in use, the MCU reads the corresponding stored resistance value in the memory according to the current light output level and adjusts the resistance value of the variable resistor R2 to be consistent with the stored resistance value.

[0016] Optionally, the given value output by the optoelectronic detection circuit is in the range of 1 / 3 to 2 / 3 of the saturation value of the ADC module.

[0017] Optionally, the MCU controls the writing of the memory through a corresponding communication protocol.

[0018] Optionally, the MCU adjusts the resistance value of the variable resistor R2 through a corresponding communication protocol.

[0019] In some other embodiments, the present invention further provides an adaptive adjustment optoelectronic detection circuit applied to a fiber laser, including: an optoelectronic detection circuit, an MCU, and a memory; the optoelectronic detection circuit is placed at the optical path monitoring point of the fiber laser; the optoelectronic detection circuit includes a photodiode D1, a transimpedance amplifier, and a proportional amplifier; the proportional amplifier includes an operational amplifier U2, a variable resistor R1, and a resistor R2;

[0020] The positive electrode of the photodiode D1 is connected to the input end of the transimpedance amplifier; the negative electrode of the photodiode D1 is connected to the power supply VCC; the output end of the transimpedance amplifier is connected to the first fixed contact of the variable resistor R1; the second fixed contact of the variable resistor R1 is respectively connected to one end of the resistor R2 and the inverting input end of the operational amplifier U2; the non-inverting input end of the operational amplifier U2 is grounded; the output end of the operational amplifier U2 is respectively connected to the other end of the resistor R2 and the ADC module of the MCU; the MCU is also respectively communicatively connected to the adjustable contact of the variable resistor R1 and the memory.

[0021] Optionally, the transimpedance amplifier includes an operational amplifier U1, a resistor RF, and a capacitor CF; the inverting input terminal of the operational amplifier U1 is respectively connected to the positive electrode of the photodiode D1, one end of the resistor RF, and one end of the capacitor CF; the non-inverting input terminal of the operational amplifier U1 is grounded; the output terminal of the operational amplifier U1, the other end of the resistor RF, and the other end of the capacitor CF are all connected to the first fixed contact of the variable resistor R1.

[0022] Correspondingly, the present invention also provides an adaptive adjustment photoelectric detection method applied to a fiber laser, which is applied to the above-mentioned adaptive adjustment photoelectric detection circuit. The adaptive adjustment photoelectric detection method includes:

[0023] The MCU sets a given value output by the photoelectric detection circuit according to the light output level of the fiber laser.

[0024] The ADC module inside the MCU samples the actual output value of the photoelectric detection circuit, adjusts the resistance value of the variable resistor R1 through the PI control algorithm until the actual output value reaches the given value, and writes the resistance value of the variable resistor R1 at this time into the memory.

[0025] When the fiber laser is in use, the MCU reads the corresponding stored resistance value in the memory according to the current light output level and adjusts the resistance value of the variable resistor R1 to be consistent with the stored resistance value.

[0026] According to the specific embodiments provided by the present invention, the following technical effects are disclosed:

[0027] The adaptive adjustment photoelectric detection circuit applied to the fiber laser provided by the present invention includes a photoelectric detection circuit, an MCU, and a memory; wherein the photoelectric detection circuit is placed at the optical path monitoring point of the fiber laser; the MCU sets a given value output by the photoelectric detection circuit according to the light output level of the fiber laser; the ADC module inside the MCU samples the actual output value of the photoelectric detection circuit, adjusts the resistance value of the variable resistor through the PI control algorithm until the actual output value reaches the given value, and writes the resistance value of the variable resistor at this time into the memory; when the fiber laser is in use, the MCU reads the corresponding stored resistance value in the memory according to the current light output level and adjusts the resistance value of the variable resistor to be consistent with the stored resistance value. The present invention uses a variable resistor to replace a fixed-resistance resistor, dynamically adjusts the resistance value of the variable resistor through the MCU, eliminates the need for manual disassembly and replacement, reduces the workload during the debugging process and the risk of damage to the fiber laser. Description of the Drawings

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for use in the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0029] Figure 1 FIG. 1 is a schematic structural diagram of an adaptive adjustment optoelectronic detection circuit applied to a fiber laser provided in Embodiment 1 of the present invention;

[0030] Figure 2 FIG. 2 is a schematic principle diagram of a method for setting the resistance value of a variable resistor at different light output levels during the debugging process of a fiber laser;

[0031] Figure 3 FIG. 3 is a schematic diagram of the process of reading the resistance value of a variable resistor at different light output levels when a fiber laser is in use;

[0032] Figure 4 FIG. 4 is a schematic structural diagram of an adaptive adjustment optoelectronic detection circuit applied to a fiber laser provided in Embodiment 2 of the present invention. Detailed Embodiment

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0034] The object of the present invention is to provide an adaptive adjustment optoelectronic detection circuit and method applied to a fiber laser, which uses a variable resistor to replace a fixed-resistance resistor, dynamically adjusts the resistance value of the variable resistor through an MCU, eliminates the need for manual replacement, and reduces the workload during the debugging process and the risk of damage to the fiber laser.

[0035] To make the above objects, features, and advantages of the present invention more clearly understood, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0036] Embodiment 1

[0037] Refer to Figure 1, An adaptive adjustment optoelectronic detection circuit applied to a fiber laser provided in the first embodiment of the present invention includes: an optoelectronic detection circuit, an MCU, and a memory. Specifically, the optoelectronic detection circuit includes a photodiode D1, a transimpedance amplifier, and a proportional amplifier. The optoelectronic detection circuit is placed at the optical path monitoring point of the fiber laser. The photodiode D1 is used to convert the optical power of the fiber laser into a current signal; the transimpedance amplifier is used to convert the current signal into a voltage signal; the proportional amplifier is used to proportionally amplify the output voltage signal of the transimpedance amplifier to a voltage signal with a suitable amplitude, and at the same time reverse it to convert the negative voltage signal output by the transimpedance amplifier into a positive voltage signal Vout.

[0038] Specifically, the transimpedance amplifier includes an operational amplifier U1, a resistor RF, and a capacitor CF. The proportional amplifier includes an operational amplifier U2, a resistor R1, and a variable resistor R2. The fixed feedback resistor of the traditional optoelectronic detection circuit is replaced with a variable resistor.

[0039] As Figure 1 shown, the negative electrode of the photodiode D1 is connected to the power supply VCC. The inverting input terminal of the operational amplifier U1 is respectively connected to the positive electrode of the photodiode D1, one end of the resistor RF, and one end of the capacitor CF. The non-inverting input terminal of the operational amplifier U1 is grounded. The output terminal of the operational amplifier U1, the other end of the resistor RF, and the other end of the capacitor CF are all connected to one end of the resistor R1. The other end of the resistor R1 is respectively connected to the first fixed contact of the variable resistor R2 and the inverting input terminal of the operational amplifier U2. The non-inverting input terminal of the operational amplifier U2 is grounded. The output terminal of the operational amplifier U2 is respectively connected to the second fixed contact of the variable resistor R2 and the ADC module of the MCU. The signal at the output terminal of the operational amplifier U2 is Vout. The MCU is also respectively communicatively connected to the adjustable contact of the variable resistor R2 and the memory.

[0040] In the present invention, the output Vout of the optoelectronic detection circuit is connected to the ADC module inside the MCU for sampling. The ADC sampling input range is usually preferably selected in the range of 1 / 3 to 2 / 3 of its maximum value. A given value of the PD detection circuit output is set inside the MCU, and a PI control algorithm is written to introduce a negative feedback control mechanism. The resistance value of the variable resistor R2 is adjusted by the PI controller until the actual output value reaches the set value.

[0041] During the control process of the negative feedback, the MCU generally adjusts the resistance value of the variable resistor R2 through a corresponding communication protocol. Common communication protocols include USART, SPI, I2C, etc.

[0042] After the actual output value of the optoelectronic detection circuit reaches the given value, the resistance value of the variable resistor R2 at this time is stored in an external memory. Similarly, the MCU generally controls the writing of the memory through corresponding communication protocols, and common communication protocols include SPI, I2C, etc.

[0043] In practical applications, the variable resistor R2 can use a digital potentiometer or other types of variable resistors. The memory can use memories such as EEPROM.

[0044] During the debugging process of the fiber laser, the method for setting the resistance value of the variable resistor at different light output levels is as Figure 2 shown, specifically including:

[0045] (2.1) Set the light output level of the fiber laser on the computer PC host and emit light; different light output levels indicate that the laser emits light with different intensities.

[0046] (2.2) Set the given value output by the PD detection circuit inside the MCU, generally selected in the range of 1 / 3 to 2 / 3 of the ADC maximum value (i.e., the saturation value); the ADC module detects the voltage value Vout output by the optoelectronic detection circuit. That is to say, it is necessary to set the output value of the PD in the range of 1 / 3 to 2 / 3 of the ADC maximum value at all light output levels, which is equivalent to adjusting the resistance value of the variable resistor so that different light output levels correspond to different resistance values of the variable resistor.

[0047] (2.3) The ADC module inside the MCU samples the actual output value of the PD detection circuit, writes the PI control algorithm inside the MCU, introduces a negative feedback control mechanism, and adjusts the resistance value of the variable resistor through the PI controller until the actual output value reaches the set value.

[0048] (2.4) Save the dynamically adjusted resistance value of the variable resistor to a memory such as EEPROM.

[0049] When the fiber laser is in use, the process of reading the resistance value of the variable resistor at different light output levels is as Figure 3 shown, including:

[0050] (3.1) Adjust the fiber laser to a certain light output level.

[0051] (3.2) The MCU reads the corresponding saved resistance value in the memory according to the current light output level.

[0052] (3.3) The MCU adjusts the resistance value of the variable resistor to be consistent with the read saved resistance value through the corresponding communication protocol.

[0053] (3.4) After the resistance value of the variable resistor is updated, control the fiber laser to emit light.

[0054] The present invention makes the output of the PD detection circuit a closed-loop control. During the light intensity adjustment of different gears of the laser, the output of the PD detection circuit is always set to be within the range of 1 / 3 to 2 / 3 of the maximum value of the ADC, and accordingly, the resistance value of the variable resistor is adjusted and stored in a memory such as an EEPROM.

[0055] Applied to the adaptive adjustment optoelectronic detection circuit described in Embodiment 1, the present invention also provides an adaptive adjustment optoelectronic detection method for a fiber laser, including:

[0056] The MCU sets the given value of the output of the optoelectronic detection circuit according to the light output gear of the fiber laser; the given value of the output of the optoelectronic detection circuit is within the range of 1 / 3 to 2 / 3 of the saturation value of the ADC module;

[0057] The ADC module inside the MCU samples the actual output value of the optoelectronic detection circuit, adjusts the resistance value of the variable resistor R2 through the PI control algorithm until the actual output value reaches the given value, and writes the resistance value of the variable resistor R2 at this time into the memory through the corresponding communication protocol;

[0058] When the fiber laser is in use, the MCU reads the corresponding stored resistance value in the memory according to the current light output gear and adjusts the resistance value of the variable resistor R2 to be consistent with the stored resistance value through the corresponding communication protocol.

[0059] Embodiment 2

[0060] The difference between Embodiment 2 and Embodiment 1 is that R1 is used as the variable resistor to adjust the resistance value of R1. As Figure 4 shown, an adaptive adjustment optoelectronic detection circuit for a fiber laser in Embodiment 2 includes: an optoelectronic detection circuit, an MCU, and a memory. The optoelectronic detection circuit includes a photodiode D1, a transimpedance amplifier, and a proportional amplifier. The transimpedance amplifier includes an operational amplifier U1, a resistor RF, and a capacitor CF. The proportional amplifier includes an operational amplifier U2, a variable resistor R1, and a resistor R2.

[0061] Among them, the negative electrode of the photodiode D1 is connected to the power supply VCC. The inverting input terminal of the operational amplifier U1 is respectively connected to the positive electrode of the photodiode D1, one end of the resistor RF, and one end of the capacitor CF. The non-inverting input terminal of the operational amplifier U1 is grounded. The output terminal of the operational amplifier U1, the other end of the resistor RF, and the other end of the capacitor CF are all connected to the first fixed contact of the variable resistor R1. The second fixed contact of the variable resistor R1 is respectively connected to one end of the resistor R2 and the inverting input terminal of the operational amplifier U2. The non-inverting input terminal of the operational amplifier U2 is grounded. The output terminal of the operational amplifier U2 is respectively connected to the other end of the resistor R2 and the ADC module of the MCU. The MCU is also respectively communicatively connected to the adjustable contact of the variable resistor R1 and the memory.

[0062] Applied to the adaptive adjustment photoelectric detection circuit described in Embodiment 2, the adaptive adjustment photoelectric detection method of the fiber laser includes:

[0063] The MCU sets a given value output by the photoelectric detection circuit according to the light output gear of the fiber laser; the given value output by the photoelectric detection circuit is in the range of 1 / 3 to 2 / 3 of the saturation value of the ADC module;

[0064] The ADC module inside the MCU samples the actual output value of the photoelectric detection circuit, adjusts the resistance value of the variable resistor R1 through the PI control algorithm until the actual output value reaches the given value, and writes the resistance value of the variable resistor R1 at this time into the memory through the corresponding communication protocol;

[0065] When the fiber laser is in use, the MCU reads the corresponding saved resistance value in the memory according to the current light output gear, and adjusts the resistance value of the variable resistor R1 to be consistent with the saved resistance value through the corresponding communication protocol.

[0066] Other embodiments

[0067] The present invention introduces closed-loop control into the PD detection circuit, dynamically adjusts the resistance value in the PD detection circuit according to different light output levels of the laser, and realizes the adaptive adjustment of the PD detection circuit. In terms of the working principle, the alternative solutions of Embodiments 1 and 2 of the present invention may also include:

[0068] (a) Using multiple fixed-value resistors, and using the MCU to dynamically select different fixed-value resistors or combinations;

[0069] (b) Setting the output value of the PD detection circuit to a fixed value or a certain range;

[0070] (c) Selecting PID, P, PD or other intelligent controller algorithms for the control algorithm in the MCU.

[0071] The present invention introduces a control algorithm such as PI into the PD detection circuit. At different light intensities output by the laser, the feedback resistance value of the PD detection circuit is adaptively adjusted, which can always ensure that the output of the PD detection circuit is within the optimal range of the ADC input voltage, thus realizing effective protection for the laser. By adding a controller such as PI in the MCU to adaptively adjust the feedback resistance value of the PD detection circuit, the process of manually replacing the resistor during the laser debugging process is completely avoided, which not only reduces the labor cost but also avoids the risk of damaging the optical fiber and adjacent optical devices during the resistor replacement process.

[0072] In addition, by using the adaptive adjustment optoelectronic detection method of the present invention, during the normal operation of the laser, the outputs of all PD detection circuits with different light intensity levels are basically the same. Therefore, the upper and lower limit protection thresholds of the PD detection can be set uniformly. Compared with the previous situation where different PD detection upper and lower limit protection thresholds need to be set for different light intensity levels and the PD detection output values with a relatively large actual working range, the staff can more clearly identify the working state of the laser, effectively avoiding the situation of false protection caused by inaccurate ADC readings and improving the working reliability of the laser.

[0073] In this article, specific examples are used to elaborate on the principle and implementation mode of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. An adaptive adjustment optoelectronic detection method applied to a fiber laser, characterized in that, Applied to an adaptive adjustment optoelectronic detection circuit, the adaptive adjustment optoelectronic detection circuit includes: an optoelectronic detection circuit, an MCU, and a memory; the optoelectronic detection circuit is placed at the optical path monitoring point of the fiber laser; the optoelectronic detection circuit includes a photodiode D1, a transimpedance amplifier, and a proportional amplifier; the proportional amplifier includes an operational amplifier U2, a resistor R1, and a variable resistor R2; The positive electrode of the photodiode D1 is connected to the input end of the transimpedance amplifier; the negative electrode of the photodiode D1 is connected to the power supply VCC; the output end of the transimpedance amplifier is connected to one end of the resistor R1; the other end of the resistor R1 is respectively connected to the first fixed contact of the variable resistor R2 and the inverting input end of the operational amplifier U2; the non-inverting input end of the operational amplifier U2 is grounded; the output end of the operational amplifier U2 is respectively connected to the second fixed contact of the variable resistor R2 and the ADC module of the MCU; the MCU is also respectively communicatively connected to the adjustable contact of the variable resistor R2 and the memory; The adaptive adjustment optoelectronic detection method includes: The MCU sets a given value output by the optoelectronic detection circuit according to the light output gear of the fiber laser; The ADC module inside the MCU samples the actual output value of the optoelectronic detection circuit, adjusts the resistance value of the variable resistor R2 through the PI control algorithm until the actual output value reaches the given value, and writes the resistance value of the variable resistor R2 at this time into the memory; When the fiber laser is in use, the MCU reads the corresponding saved resistance value in the memory according to the current light output gear and adjusts the resistance value of the variable resistor R2 to be consistent with the saved resistance value.

2. The adaptive adjustment optoelectronic detection method according to claim 1, wherein The transimpedance amplifier includes an operational amplifier U1, a resistor RF, and a capacitor CF; the inverting input end of the operational amplifier U1 is respectively connected to the positive electrode of the photodiode D1, one end of the resistor RF, and one end of the capacitor CF; the non-inverting input end of the operational amplifier U1 is grounded; the output end of the operational amplifier U1, the other end of the resistor RF, and the other end of the capacitor CF are all connected to one end of the resistor R1.

3. The adaptive adjustment optoelectronic detection method according to claim 1, wherein The variable resistor R2 uses a digital potentiometer.

4. The adaptive adjustment optoelectronic detection method according to claim 1, wherein The given value output by the optoelectronic detection circuit is in the range of 1 / 3 to 2 / 3 of the saturation value of the ADC module.

5. The adaptive adjustment optoelectronic detection method according to claim 1, wherein The MCU controls the writing of the memory through a corresponding communication protocol.

6. The adaptive adjustment optoelectronic detection method according to claim 1, wherein The MCU adjusts the resistance value of the variable resistor R2 through a corresponding communication protocol.

7. An adaptive adjustment photoelectric detection method applied to a fiber laser, characterized in that, Applied to an adaptive adjustment optoelectronic detection circuit, the adaptive adjustment optoelectronic detection circuit includes: an optoelectronic detection circuit, an MCU, and a memory; the optoelectronic detection circuit is placed at the optical path monitoring point of the fiber laser; the optoelectronic detection circuit includes a photodiode D1, a transimpedance amplifier, and a proportional amplifier; the proportional amplifier includes an operational amplifier U2, a variable resistor R1, and a resistor R2; The positive electrode of the photodiode D1 is connected to the input end of the transimpedance amplifier; the negative electrode of the photodiode D1 is connected to the power supply VCC; the output end of the transimpedance amplifier is connected to the first fixed contact of the variable resistor R1; the second fixed contact of the variable resistor R1 is respectively connected to one end of the resistor R2 and the inverting input end of the operational amplifier U2; the non-inverting input end of the operational amplifier U2 is grounded; the output end of the operational amplifier U2 is respectively connected to the other end of the resistor R2 and the ADC module of the MCU; the MCU is also respectively communicatively connected to the adjustable contact of the variable resistor R1 and the memory; The adaptive adjustment photoelectric detection method includes: The MCU sets a given value output by the photoelectric detection circuit according to the light output gear of the fiber laser; The ADC module inside the MCU samples the actual output value of the photoelectric detection circuit, adjusts the resistance value of the variable resistor R1 through the PI control algorithm until the actual output value reaches the given value, and writes the resistance value of the variable resistor R1 at this time into the memory; When the fiber laser is in use, the MCU reads the corresponding saved resistance value in the memory according to the current light output gear and adjusts the resistance value of the variable resistor R1 to be consistent with the saved resistance value.

8. The adaptive adjustment photoelectric detection method according to claim 7, wherein The transimpedance amplifier includes an operational amplifier U1, a resistor RF and a capacitor CF; the inverting input end of the operational amplifier U1 is respectively connected to the positive electrode of the photodiode D1, one end of the resistor RF and one end of the capacitor CF; the non-inverting input end of the operational amplifier U1 is grounded; the output end of the operational amplifier U1, the other end of the resistor RF and the other end of the capacitor CF are all connected to the first fixed contact of the variable resistor R1.

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