A laser control system for a precision detection instrument

Abstract

The utility model relates to a kind of laser control system for precision detection instrument, including control module, temperature sensor, fan drive module, fan, digital-analog converter and laser, wherein, the control module is used to generate digital control signal and send to digital-analog converter, the digital-analog converter is used to convert received digital control signal into analog voltage signal, and send to laser to control the output power of laser;The temperature sensor is used to collect the real-time temperature of laser and feedback to control module, the control module is used to adjust fan speed by fan drive module according to received laser real-time temperature, and the fan is used to heat dissipation to laser.The laser control system of the utility model is simple structure, and control precision is higher.

Description

Technical Field

[0001] This utility model relates to the field of laser control technology, and in particular to a laser control system for precision testing instruments. Background Technology

[0002] As a core light source for precision instruments such as Raman spectrometers and biological detection equipment, the stability and controllability of 785nm lasers directly affect detection accuracy. Laser performance is significantly influenced by temperature and power adjustment.

[0003] Current laser control technologies have certain limitations. First, while existing technologies use fans to cool the laser, the temperature control method is too coarse. The non-real-time closed-loop regulation and abrupt fan start-stop cycles lead to large temperature fluctuations, causing wavelength drift and power attenuation, thus affecting spectral stability. Second, current technologies lack sufficient power adjustment precision. Precision detection requires continuous power adjustment from 0-100%, but traditional analog circuits lack the necessary precision to meet the demands of high-precision applications. Third, the overall hardware structure of current laser control technologies is fragmented and has low integration, making them unsuitable for miniaturized precision instruments.

[0004] In summary, existing methods for controlling lasers have drawbacks such as abrupt start-stop of the laser cooling fan, insufficient precision in laser power adjustment, and low integration of the laser control hardware system. Utility Model Content

[0005] Therefore, the technical problem to be solved by this utility model is to overcome the problems of abrupt start and stop of the fan for laser heat dissipation, insufficient power adjustment accuracy of the laser, and low integration of the hardware system for laser control in the existing laser control methods.

[0006] To solve the above-mentioned technical problems, this utility model provides a laser control system for precision testing instruments, including a control module, a temperature sensor, a fan drive module, a fan, a digital-to-analog converter, and a laser. The control module is connected to the temperature sensor, the control module is connected to the fan through the fan drive module, and the control module is connected to the laser through the digital-to-analog converter; The control module generates digital control signals and sends them to a digital-to-analog converter (DAC). The DAC converts the received digital control signals into analog voltage signals and sends them to the laser to control its output power. The temperature sensor collects the real-time temperature of the laser and feeds it back to the control module. The control module adjusts the fan speed according to the received real-time laser temperature via a fan drive module. The fan is used to dissipate heat from the laser.

[0007] In one embodiment of this utility model, the fan drive module uses an N-MOS transistor, the gate of the N-MOS transistor is connected to the control module, the drain of the N-MOS transistor is connected to the fan, and the source of the N-MOS transistor is grounded.

[0008] In one embodiment of this utility model, a laser driving module is further included, which is connected to the digital-to-analog converter and the laser respectively; The laser driver module is used to convert the analog voltage signal output by the digital-to-analog converter into a current signal, and the laser outputs the corresponding optical power according to the received current signal.

[0009] In one embodiment of this utility model, the laser driver module is model LDTC0520.

[0010] In one embodiment of this utility model, the temperature sensor is model DS18B20.

[0011] In one embodiment of this utility model, the digital-to-analog converter is a DAC8830 digital-to-analog converter.

[0012] In one embodiment of this utility model, the DAC8830 digital-to-analog converter is connected to the control module via an SPI interface.

[0013] In one embodiment of this utility model, the control module is a Raspberry Pi Pico development board, model RP2040.

[0014] In one embodiment of this utility model, a power supply module is also included, which is connected to the control module and the fan respectively, and is used to supply power to the control module and the fan.

[0015] In one embodiment of this utility model, the temperature sensor is attached to the laser.

[0016] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art: The laser control system of this utility model for precision testing instruments can realize real-time and precise control of the fan through the control module, so that the fan can effectively and precisely cool the laser and keep the laser at a normal temperature. The digital-to-analog converter of this invention adopts the DAC8830 digital-to-analog converter. The DAC8830 is a 16-bit voltage output type digital-to-analog converter that achieves a voltage output with a resolution of 0.01mV in the range of 1.0-1.2V, and corresponds to linear adjustment of laser power from 0-100%, which can meet the stringent requirements of precision detection for laser power. This invention integrates a laser control system for precision testing instruments (including laser power control, temperature sensor for laser temperature acquisition, and fan for laser heat dissipation) into a single control module (i.e., Raspberry Pi Pico development board), achieving a high degree of integration. Attached Figure Description

[0017] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. Figure 1 This is a schematic diagram of the laser control system structure for precision testing instruments in this embodiment of the present invention; Figure 2 This is a schematic diagram showing the connection between the digital-to-analog converter and the laser via a laser driver module in an embodiment of this utility model. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0019] Reference Figure 1 As shown, this utility model relates to a laser control system for precision testing instruments, including a control module 1, a temperature sensor 2, a fan drive module 3, a fan 4, a digital-to-analog converter 5, and a laser 6, wherein... The control module 1 is connected to the temperature sensor 2, the control module 1 is connected to the fan 4 through the fan drive module 3, and the control module 1 is connected to the laser 6 through the digital-to-analog converter 5; The control module 1 is used to generate digital control signals and send them to the digital-to-analog converter 5. The digital-to-analog converter 5 is used to convert the received digital control signals into analog voltage signals and send them to the laser 6 to control the output power of the laser 6.

[0020] The temperature sensor 2 is used to collect the real-time temperature of the laser 6 and feed it back to the control module 1. The control module 1 is used to adjust the speed of the fan 4 through the fan drive module 3 according to the received real-time temperature of the laser 6. The fan 4 is used to dissipate heat from the laser 6.

[0021] Furthermore, the digital control signals generated by control module 1 can originate from the host computer.

[0022] Furthermore, in this embodiment, laser 6 is a 785nm laser.

[0023] Furthermore, in this embodiment, the fan drive module 3 uses an N-MOS transistor. The gate of the N-MOS transistor is connected to the control module 1, the drain of the N-MOS transistor is connected to the fan 4, and the source of the N-MOS transistor is grounded.

[0024] In this embodiment, the control module 1 compares the real-time temperature of the laser 6 collected by the temperature sensor 2 with the temperature threshold (usually 25°C) to generate a PWM signal (pulse width modulation signal). This PWM signal is actually the PWM duty cycle (0-100%). The PWM duty cycle is the proportion of the conduction time of the N-MOS transistor. The control module 1 transmits the PWM duty cycle to the N-MOS transistor. The N-MOS transistor drives the fan 4 to work according to the received PWM duty cycle, specifically controlling the speed of the fan 4 to increase or decrease.

[0025] Furthermore, control module 1 compares the collected temperature of laser 6 with the temperature threshold (25°C). If the collected temperature of laser 6 is greater than 25°C, control module 1 increases the output PWM duty cycle (increasing the speed of fan 4). If the collected temperature of laser 6 is less than or equal to 25°C, control module 1 sets the output PWM duty cycle to 0% (indicating that fan 4 stops). It should be noted that the PWM duty cycle in this embodiment can be specifically calculated by the PID control algorithm built into control module 1. Since the PID control algorithm is existing technology, it will not be described in detail in this embodiment.

[0026] In this embodiment, the control module 1 enables real-time and precise control of the fan 4, thereby allowing the fan 4 to dynamically adjust the heat dissipation intensity of the laser 6 and stabilize the temperature of the laser 6 within 25±0.2℃. Compared with the prior art, the temperature stability of the laser 6 in this embodiment is improved from 25±0.5℃ to 25±0.2℃, effectively suppressing the wavelength drift and power attenuation of the laser 6 and ensuring the working efficiency of the laser 6.

[0027] Please see Figure 2This embodiment also includes a laser driving module 7, which is connected to the digital-to-analog converter 5 and the laser 6 respectively. The laser driving module 7 is used to convert the analog voltage signal output by the digital-to-analog converter 5 into a current signal, and the laser 6 outputs the corresponding power according to the received current signal.

[0028] Furthermore, the digital-to-analog converter 5 in this embodiment adopts a DAC8830 digital-to-analog converter. The DAC8830 is a 16-bit voltage output type digital-to-analog converter that achieves a voltage output with a resolution of 0.01mV in the range of 1.0-1.2V, corresponding to linear adjustment of laser power from 0-100%.

[0029] Furthermore, the laser driver module 7 in this embodiment is model LDTC0520.

[0030] Furthermore, the temperature sensor 2 in this embodiment is model DS18B20.

[0031] Furthermore, in this embodiment, the DAC8830 digital-to-analog converter is connected to the control module 1 via an SPI interface.

[0032] Furthermore, in this embodiment, the control module 1 is a Raspberry Pi Pico development board, model RP2040.

[0033] It is worth mentioning that this embodiment can integrate the laser control system for precision testing instruments (including the power control of laser 6, the temperature acquisition function of temperature sensor 2 for laser 6, and the heat dissipation function of fan 4 for laser 6) into one unit through the Raspberry Pi Pico development board, with a high degree of integration.

[0034] Furthermore, this embodiment also includes a power supply module 8, which is connected to the control module 1 and the fan 4 respectively, and is used to supply power to the control module 8 and the fan 4.

[0035] Specifically, in this embodiment, the power module 8 has a voltage of 5V and is connected to the control module 1 and the fan 4 via a USB interface. The use of a USB interface allows for plug-and-play functionality.

[0036] Furthermore, in this embodiment, the temperature sensor 2 is attached to the laser 6, and the temperature sensor 2 should be in close contact with the heat dissipation part of the laser 6.

[0037] Furthermore, in this embodiment, the control module 1 and the temperature sensor 2 are connected by a wired connection.

[0038] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A laser control system for precision testing instruments, characterized in that: It includes a control module (1), a temperature sensor (2), a fan drive module (3), a fan (4), a digital-to-analog converter (5), and a laser (6), wherein, The control module (1) is connected to the temperature sensor (2), the control module (1) is connected to the fan (4) through the fan drive module (3), and the control module (1) is connected to the laser (6) through the digital-to-analog converter (5). The control module (1) is used to generate digital control signals and send them to the digital-to-analog converter (5). The digital-to-analog converter (5) is used to convert the received digital control signals into analog voltage signals and send them to the laser (6) to control the output power of the laser (6). The temperature sensor (2) is used to collect the real-time temperature of the laser (6) and feed it back to the control module (1). The control module (1) is used to adjust the speed of the fan (4) through the fan drive module (3) according to the received real-time temperature of the laser (6). The fan (4) is used to dissipate heat from the laser (6).

2. The laser control system for precision testing instruments according to claim 1, characterized in that: The fan drive module (3) uses an N-MOS transistor. The gate of the N-MOS transistor is connected to the control module (1), the drain of the N-MOS transistor is connected to the fan (4), and the source of the N-MOS transistor is grounded.

3. The laser control system for precision testing instruments according to claim 1, characterized in that: It also includes a laser driver module (7), which is connected to the digital-to-analog converter (5) and the laser (6) respectively; The laser driving module (7) is used to convert the analog voltage signal output by the digital-to-analog converter (5) into a current signal, and the laser (6) outputs the corresponding power according to the received current signal.

4. The laser control system for precision testing instruments according to claim 3, characterized in that: The laser driver module (7) is model LDTC0520.

5. The laser control system for precision testing instruments according to claim 1, characterized in that: The temperature sensor (2) is model DS18B20.

6. The laser control system for precision testing instruments according to claim 1, characterized in that: The digital-to-analog converter (5) is a DAC8830 digital-to-analog converter.

7. The laser control system for precision testing instruments according to claim 6, characterized in that: The DAC8830 digital-to-analog converter is connected to the control module (1) via an SPI interface.

8. The laser control system for precision testing instruments according to claim 1, characterized in that: The control module (1) is a Raspberry Pi Pico development board, model RP2040.

9. The laser control system for precision testing instruments according to claim 1, characterized in that: It also includes a power supply module (8), which is connected to the control module (1) and the fan (4) respectively, and is used to supply power to the control module (8) and the fan (4).

10. The laser control system for precision testing instruments according to claim 1, characterized in that: The temperature sensor (2) is attached to the laser (6).

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