Large triggering delay quantization measuring method for laser vibration measurement calibration

Abstract

The invention relates to a large triggering delay quantization measuring method for laser vibration measurement calibration, and belongs to the technical field of wireless measurement testing. The characteristics that the phase difference and the frequency of sine signals corresponding to the same delay time difference are in direct proportion and the phase has the periodic quantization characteristic at the same time are utilized, three different frequency sine waveforms in mutual prime number rules are used as triggering excitation signals, the characteristics that the phase difference phik of fixed triggering delay tau under different frequencies fk has the quantization characteristic of jumping at 2pi intervals on the basis of a basic phase difference and theoretically different frequency points (fk, phik) are on the same straight line are used for judging a quantization integer, tau is measured with the sine excitation signal cycle (frequencies fk) and the phase difference phik, and the delay of a laser vibration measurement instrument can be further read through the large triggering delay measurement function of a digital oscilloscope. According to the large triggering delay quantization measuring method for laser vibration measurement calibration, no hardware delay devices are needed, and any selected large triggering delay can be accurately measured and calibrated.

Description

technical field [0001] The invention relates to a quantization measurement method with a large trigger delay for laser vibration measurement and calibration, and belongs to the technical field of radio measurement and testing. Background technique [0002] For the vibration measurement problem in vibration measurement and calibration, since the signal waveform comes from the sine wave of the electrical signal source, the final output is the sinusoidal vibration waveform output by the vibration table. After passing through electromechanical links such as power amplifiers and mechanical vibration tables, the sinusoidal vibration waveform has a relatively large time delay compared with the sinusoidal waveform in the electrical signal source. If the time delay is greater than one sinusoidal waveform period, it is generally considered to be a large delay. , can not be solved by the direct phase measurement method, and can only be measured and calibrated by a special trigger delay...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the shortcomings of the existing trigger delay measurement method, aiming at the current technical situation that the measurement calibration of the digital oscilloscope trigger with a large delay requires a high-precision large delay device and the delay cannot be set arbitrarily and the accuracy is not easy to be high. A Quantization Measurement Method of Large Trigger Delay for Laser Vibrometer Calibration

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