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System for generating small-angle phase shifting and detecting

A small-angle, phase-shifting technology, applied in measuring devices, measuring electrical variables, phase angle between voltage and current, etc., can solve the problem of inaccurate measurement of signals, and achieve the effect of simple structure and low cost

Active Publication Date: 2015-06-10
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention can achieve high-precision phase detection for large signals, but it cannot accurately measure signals less than 0.7v, and its measurement voltage must be greater than the conduction voltage of the diode

Method used

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  • System for generating small-angle phase shifting and detecting
  • System for generating small-angle phase shifting and detecting
  • System for generating small-angle phase shifting and detecting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1 of the present invention such as figure 1As shown, a system capable of generating a small angular phase shift and capable of detection, including a laser 1, a 1*2 coupler 3, sensing fibers A6 and B9, photodetectors A7 and B10, self-gaining modules A8 and B11, Subtractor 12, voltage follower 13, bandpass filter 14, lock-in amplifier 15, data acquisition card 16 and computer 17, it is characterized in that No. 1 port 2 of 1*2 coupler 3 is connected to laser 1; 1*2 coupling Ports 2 and 3 of sensor 3 are respectively connected to sensing fibers A6 and B9, the output ends of sensing fibers A6 and B9 are respectively connected to photodetector A7 and photodetector B10, and the output ends of photodetectors A7 and B10 are respectively connected to To the self-gaining modules A8 and B11, the output terminals of the self-gaining modules A8 and B11 are connected to the two input terminals of the subtractor 12 respectively, and the subtractor 12 is connected with a vo...

Embodiment 2

[0051] A method for detecting small-angle phase shifts using the above-mentioned system, including the generation of phase shifts and the measurement of phase shifts, the steps of the method are as follows:

[0052] 1) Generation of phase shift

[0053] a. Connect the optical path and circuit of the above system, and power on the laser and each circuit;

[0054] b. Adjust the optical path so that the laser output from the laser is incident on the No. 1 port of the 1*2 coupler, that is, the input port, and the output port of the 1*2 coupler, that is, the No. 2 port, has a connection length of x 1 The other end of the sensing fiber is connected to the photodetector A; the other output port of the 1*2 coupler, namely port 3, has a connection length of x 2 Sensing Fiber, Sensing Fiber x 2 Connected to photodetector B;

[0055] c. The two beams of laser beams respectively have a length of x 1 、x 2 After the sensing fiber reaches the input ends of photodetectors A and B respect...

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Abstract

The invention provides a system for generating small-angle phase shifting and detecting, and belongs to the technical field of phase detection. The system comprises a laser, a coupler, sensing optical fibers, a detector, a self-gain module, a subtractor, a voltage follower, a band pass filter, a lock phase amplifier and a data acquiring card. According to the system, the light outputted by the laser is divided into two ways through the coupler, and the sensing optical fibers through which the two lights pass are different in length, so that the two lights generate optical path difference; an optical signal is converted into an electric signal through a photoelectric detector, so as to obtain two electric signals under small-angle phase shifting; the obtained two electric signals are processed by the self-gain module, the subtractor, the filter, the lock phase amplifier and the data acquiring card to accurately measure the phase shifting of the two signals. With the adoption of the system, the 0.01-degree phase shifting can be accurately and stably generated, and moreover, the phase shifting of a weak signal can be detected; the system is simple in structure, low in cost and suitable for industrial production.

Description

technical field [0001] The present invention relates to a system capable of generating and detecting small angular phase shifts. It belongs to the technical field of phase detection. Background technique [0002] With the development of electronic technology and computer technology, phase detection technology has been developed rapidly, especially in electrical and electric power technology has been greatly valued and developed. At present, the phase detection technology has been relatively perfect, and the measurement methods and theories are relatively mature. The phase test instruments have been serialized and commercialized, and are widely used in RC, LC networks, amplifier phase-frequency characteristics, and electronic equipment that rely on signal phase to transmit information. . [0003] At present, many improved high-precision phase detection methods have been proposed at home and abroad, mainly including: (1) using a dedicated digital processing chip, using a sin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R25/04G01R15/22
Inventor 贾传武常军姜浩朱存光田长彬王福鹏陈希
Owner SHANDONG UNIV