Unlock instant, AI-driven research and patent intelligence for your innovation.

Gain automatic control device and method for i/q demodulation phase meter in laser interferometer

A gain automatic control, laser interferometer technology, applied in gain control, amplification control, measurement device and other directions, can solve the problem of affecting the measurement accuracy of the interferometer, reducing the signal-to-noise ratio, etc., to reduce the impact of noise and improve the signal-to-noise ratio. Effect

Active Publication Date: 2022-04-22
SUN YAT SEN UNIV
View PDF10 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The patent document (CN103063128A, published on April 24, 2013) discloses a dynamic electronic signal phase measurement system for a dual-frequency laser interferometer, wherein the I / O of the laser interferometer demodulates the current amplifier gain of the phase meter As a fixed value, when the interference signal is too weak, the signal-to-noise ratio will decrease, thus affecting the measurement accuracy of the interferometer

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Gain automatic control device and method for i/q demodulation phase meter in laser interferometer
  • Gain automatic control device and method for i/q demodulation phase meter in laser interferometer
  • Gain automatic control device and method for i/q demodulation phase meter in laser interferometer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A gain automatic control device of I / Q demodulation phase meter in a kind of laser interferometer, see figure 1 , the gain automatic control device 200 includes a gain adjustable amplifier 201, an amplitude calculator 202 and a gain controller 203, the input end of the gain adjustable amplifier 201 is connected to the photodetector of the I / Q demodulation phase meter The output end of (PD) 100 is connected, and the output end of gain adjustable amplifier 201 is connected with the input end of the I / Q demodulation phase measurement unit 300 of described I / Q demodulation phase meter, and described I / Q demodulation phase The I and Q outputs of the measuring unit 300 are connected to the input of the gain controller 203 through the amplitude calculator 202 , and the output of the gain controller 203 is connected to the input of the gain adjustment unit of the gain adjustable amplifier 201 .

[0030] see figure 2 After receiving the voltage signal of the gain-adjustable am...

Embodiment 2

[0041] see image 3 , a gain automatic control method of I / Q demodulation phase meter in a kind of laser interferometer, specifically comprises the following steps:

[0042] S1, through the I / Q demodulation phase measurement unit of the I / Q demodulation phase meter, obtain the I output and the Q output of the signal to be tested;

[0043] S2, sending the I-way output and the Q-way output to the amplitude calculator to obtain the real-time amplitude of the signal to be measured;

[0044] S3. Send the real-time amplitude to the gain controller to obtain the gain adjustment amount;

[0045] S4. The gain-adjustable amplifier controls the gain of the I / Q demodulation phase meter according to the gain adjustment amount.

[0046] It is worth noting that, before step S1, the I / Q demodulation phase meter is set to a locked state, so that the I / Q demodulation phase measurement unit of the I / Q demodulation phase meter has a frequency of the digitally controlled oscillator 308 Equal to t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an automatic gain control device for an I / Q demodulation phase meter in a laser interferometer, comprising an adjustable gain amplifier, an amplitude calculator and a gain controller, the input end of the adjustable gain amplifier is connected to the The output end of the photodetector of the I / Q demodulation phase meter is connected, the output end of the gain adjustable amplifier is connected with the input end of the I / Q demodulation phase measurement unit of the I / Q demodulation phase meter, and the I The I-channel output and the Q-channel output of the / Q demodulation phase measurement unit are connected to the input terminal of the gain controller through the amplitude calculator, and the output terminal of the gain controller is connected to the input terminal of the gain adjustment unit of the gain-adjustable amplifier. The invention adjusts the gain of the current amplifier and adjusts the gain of the current amplifier when the coupling efficiency decreases, thereby reducing the noise influence of the back-end circuit and improving the signal-to-noise ratio. The invention also discloses an automatic gain control method of the I / Q demodulation phase meter in the laser interferometer.

Description

technical field [0001] The invention relates to the field of precision measurement, in particular to an automatic gain control device and method for an I / Q demodulation phase meter in a laser interferometer. Background technique [0002] Laser interferometer is one of the key devices for precise measurement of physical quantities such as displacement and velocity. Laser interferometer has the advantages of large measurement range and high precision, and has been widely used in space science missions. Affected by satellite launch and space environment, the interference coupling efficiency of the laser interferometer will change during long-term measurement, which will cause the amplitude of the interferometric beat frequency signal to change. The interference beat frequency signal is converted into a voltage signal by the current amplifier, but in the case of a fixed gain of the current amplifier, if the interference signal is too weak, the signal-to-noise ratio will be redu...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01M11/00H03G3/20
CPCG01M11/00H03G3/20
Inventor 黄祥青李祝段会宗叶贤基王观芳张宪邹恕杨卓蔡成彪
Owner SUN YAT SEN UNIV