CN210375418U - High-speed acquisition circuit for pulse laser average power quasi-real-time monitoring - Google Patents
High-speed acquisition circuit for pulse laser average power quasi-real-time monitoring Download PDFInfo
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- CN210375418U CN210375418U CN201921368566.4U CN201921368566U CN210375418U CN 210375418 U CN210375418 U CN 210375418U CN 201921368566 U CN201921368566 U CN 201921368566U CN 210375418 U CN210375418 U CN 210375418U
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Abstract
The utility model discloses a high-speed acquisition circuit for accurate real-time supervision of pulse laser average power, including photodiode D1, variable resistor R1, operational amplifier U1, RMS-DC converter U2 and microcontroller U3, photodiode D1's negative pole is connected with the direct current power supply positive pole, photodiode D1's positive pole, variable resistor R1's adjustable end all is connected with operational amplifier U1's inverting input end, operational amplifier U1's output and RMS-DC converter U2 input are connected, RMS-DC converter U2's output is connected with microcontroller U3's ADC module. The utility model discloses utilize operational amplifier to realize the steady transmission of signal of telecommunication, utilize the RMS-DC converter to convert laser pulse's fluctuation to direct current signal and utilize microcontroller to carry out high-speed sampling to the power signal of input, realize in the photoelectric detection process to accurate real-time supervision, control, correction and the demarcation of laser average power.
Description
Technical Field
The utility model relates to a photoelectric detection field specifically is a high-speed acquisition circuit for the accurate real-time supervision of pulse laser average power.
Background
With the diversification of photoelectric detection technology, the application of laser is more and more extensive, and the laser power stability is an important factor influencing the photoelectric detection effect. The utility model discloses a novel circuit design for real-time supervision pulse laser average power can carry out accurate real-time supervision, control, correction and demarcation to laser average power in the photoelectric detection process.
Common laser power measurements can be simply divided into two broad categories according to the type of sensor:
the first category employs thermopile sensors. The thermopile sensor has low sensitivity and low response speed, and cannot realize synchronous detection with related photoelectric detection means quickly in practical application.
The second category employs non-thermopile sensors (e.g., photodetectors). The power test method based on the non-thermopile sensor generally adopts an integral holding circuit to realize the collection of the pulse laser peak power, the integral time of the integral circuit has certain requirements on the repetition frequency input of laser pulses, the integral time needs to change along with the change of the laser pulse frequency, the circuit is complex, and the cost is high.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a high-speed acquisition circuit for the accurate real-time supervision of pulse laser average power, can accurate real-time detection laser average power to carry out accurate real-time supervision, control, correction and demarcation to laser average power in photoelectric detection process.
The technical scheme of the utility model is that:
the utility model has the advantages that:
(1) the utility model adopts the variable resistor to set the ratio of converting the current signal into the voltage signal, thereby the circuit can adapt to the output energy of the laser with different power;
(2) the utility model increases the anti-interference ability of the current input signal by passing the current input signal of the photodiode through the operational amplifier, reduces the loss of the weak current input signal, and ensures that the current input signal is not distorted;
(3) the utility model discloses an RMS-DC converter is through solving and average the processing with the signal (like pulse signal, square wave signal, triangle wave signal etc.) that exchanges the change, converts the effective value in the unit interval to change the fluctuation of the laser pulse of input into direct current signal, reduced the influence that the laser pulse energy fluctuation was measured average power;
(4) the utility model discloses a microcontroller carries out high-speed sampling to the power signal of input, further stabilizes the average power numerical value to in time calculate average power numerical value size, thereby can realize carrying out accurate real-time supervision, control, correction and demarcation to laser average power in photoelectric detection process.
Drawings
Fig. 1 is a block diagram of the present invention.
Fig. 2 is a circuit diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1 and fig. 2, a high-speed acquisition circuit for quasi-real-time monitoring of average power of pulsed laser includes a photodiode D1, a variable resistor R1, an operational amplifier U1, an RMS-DC converter U2 and a microcontroller U3 connected with a crystal oscillator circuit, the cathode of the photodiode D1 is connected with the positive pole of a direct current power supply, the cathode of the photodiode D1 is connected with the negative pole of the direct current power supply through a filter capacitor C1 and a decoupling capacitor C5 connected in parallel, the anode of the photodiode D1 and the adjustable end of the variable resistor R1 are both connected with the inverting input end of the operational amplifier U1, one fixed end of the variable resistor R1 is connected with the negative pole of the direct current power supply, the other fixed end of the variable resistor R1 is floating, the non-inverting input end and the output end of the operational amplifier U1 are both connected with the input end of the RMS-DC converter U2 through a resistor R2, the output end of the RMS-DC converter U2 is connected with, the output end of the RMS-DC converter U2 is connected with the negative pole of the direct current power supply after passing through a filter capacitor C4.
The utility model discloses a theory of operation:
the photodiode D1 converts the optical signal into a current signal, the current signal is converted into a voltage signal after being adjusted by the variable resistor R1, and the voltage signal is subjected to voltage following processing by the operational amplifier U1, so that the input impedance is increased, the signal loss is reduced, and the stable receiving work of the input signal is completed; the RMS-DC converter U2 converts an input alternating current signal into a direct current signal, the micro control unit U3 converts an input voltage analog signal into a digital signal through the ADC module, samples the digital signal input in real time at a certain frequency, performs correlation processing on the input digital signal through an algorithm, and finally calculates a stable average power value.
The final laser power values are:
max (P1: P100) is the maximum value of 100 numerical values sampled by the microcontroller U3:
Pi＝RMS(Vi)＝RMS(IiR)＝SQRT((IiR-Ii-1R)2)；
100, Vin is a digital signal value sampled by the microcontroller U3, I is an input current signal, and R is a current resistance value of the variable resistor R1.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A high-speed acquisition circuit for pulse laser average power quasi-real-time monitoring is characterized in that: the device comprises a photodiode D1, a variable resistor R1, an operational amplifier U1, an RMS-DC converter U2 and a microcontroller U3, wherein the cathode of the photodiode D1 is connected with the anode of a direct-current power supply, the anode of the photodiode D1 and the adjustable end of the variable resistor R1 are both connected with the inverting input end of the operational amplifier U1, one fixed end of a variable resistor R1 is connected with the cathode of the direct-current power supply, the other fixed end of the variable resistor R1 is suspended, the non-inverting input end and the output end of the operational amplifier U1 are both connected with the input end of the RMS-DC converter U2, and the output end of the RMS-DC converter U2 is connected with an ADC module of the microcontroller U3.
2. The high-speed acquisition circuit for the near-real-time monitoring of the average power of the pulsed laser according to claim 1, wherein: the cathode of the photodiode D1 is connected with the cathode of the DC power supply through a filter capacitor C1 and a decoupling capacitor C5 which are connected in parallel.
3. The high-speed acquisition circuit for the near-real-time monitoring of the average power of the pulsed laser according to claim 1, wherein: the non-inverting input end and the output end of the operational amplifier U1 are connected with the input end of the RMS-DC converter U2 through a resistor R2.
4. The high-speed acquisition circuit for the near-real-time monitoring of the average power of the pulsed laser according to claim 1, wherein: the output end of the RMS-DC converter U2 is connected with the negative electrode of the direct current power supply after passing through a filter capacitor C4.
5. The high-speed acquisition circuit for the near-real-time monitoring of the average power of the pulsed laser according to claim 1, wherein: and the microcontroller U3 is connected with a crystal oscillator circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921368566.4U CN210375418U (en) | 2019-08-22 | 2019-08-22 | High-speed acquisition circuit for pulse laser average power quasi-real-time monitoring |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921368566.4U CN210375418U (en) | 2019-08-22 | 2019-08-22 | High-speed acquisition circuit for pulse laser average power quasi-real-time monitoring |
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| CN210375418U true CN210375418U (en) | 2020-04-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110470388A (en) * | 2019-08-22 | 2019-11-19 | 合肥利弗莫尔仪器科技有限公司 | A kind of high speed acquisition circuit quasi real time monitored for pulse laser mean power |
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2019
- 2019-08-22 CN CN201921368566.4U patent/CN210375418U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110470388A (en) * | 2019-08-22 | 2019-11-19 | 合肥利弗莫尔仪器科技有限公司 | A kind of high speed acquisition circuit quasi real time monitored for pulse laser mean power |
| CN110470388B (en) * | 2019-08-22 | 2024-07-23 | 合肥利弗莫尔仪器科技有限公司 | High-speed acquisition circuit for pulse laser average power quasi-real-time monitoring |
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