A closed-loop signal acquisition method in an optical interferometric gravimeter

A signal acquisition and optical interference technology, applied in scientific instruments, instruments, measurement of gravitational fields, etc., can solve the problems of complex fringe data processing, underutilized measurement sensitivity, measurement data errors, etc., to achieve easy optimization design, simple implementation scheme Flexibility and high measurement accuracy

Active Publication Date: 2018-01-12
ZHEJIANG UNIV
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Problems solved by technology

Although the acquisition process of these two data acquisition methods is relatively simple, the measurement sensitivity of the entire optical interference system is not fully utilized, which will bring errors to the final measurement data, and the processing of a large number of fringe data is very complicated.

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  • A closed-loop signal acquisition method in an optical interferometric gravimeter
  • A closed-loop signal acquisition method in an optical interferometric gravimeter
  • A closed-loop signal acquisition method in an optical interferometric gravimeter

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Embodiment Construction

[0010] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0011] The closed-loop signal acquisition method in the optical interferometric gravimeter of the present invention adopts such as figure 1 The signal acquisition device shown has a frequency-stabilized laser light source 1, a first beam splitter 2, a falling prism 3, a reference prism 4, two plane mirrors 5 arranged in parallel, a second beam splitter 6, A photodetector 9, a phase modulator 11, and a signal acquisition device of a PC host computer or an oscilloscope 10, wherein a frequency-stabilized laser light source 1, a first beam splitter 2, a phase modulator 11, a second beam splitter 6, and a photodetector 9 On the same horizontal straight line in turn, the falling prism 3 and the reference prism 4 are located on both sides of the first beam splitter 2 and on the same vertical straight line, and the two plane mirrors 5 arranged in paral...

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Abstract

The invention discloses a closed-loop signal collection method of an optical interference gravimeter. A signal collection device having a frequency-stabilizing laser source, a first beam splitter, a faller prism, a reference prism, two parallel planar mirrors, a second beam splitter, a photoelectric detector, a phase modulator and a PC upper computer or an oscilloscope is adopted. The photoelectric detector transmits optical signals collected in the falling process of the faller prism to the phase modulator as feedback signals. The phase modulator outputs a bias phase. The phase difference between light and reference light is tested in the falling process of a compensation faller, replacement is carried out when the phase compensation is up to 2[pi], and the phase compensation process is repeated. The phase difference introduced by the phase modulator and a voltage value generating the phase difference are used as the signal data obtained finally. According to the invention, the data processing is simple, and the measuring sensitivity is high.

Description

technical field [0001] The invention relates to a closed-loop signal acquisition method in an optical interference gravimeter, and is especially suitable for a signal acquisition system of an absolute gravimeter. Background technique [0002] At present, in optical interferometric gravimeters, including absolute gravimeters, since the signals to be collected are in the order of megahertz, the signal collection method commonly used is: after the optical signal is converted into an electrical signal by a photodetector, it is obtained by an oscilloscope. The stripe data is then transferred to the PC for processing; or use a photodetector plus a high-speed acquisition card to directly collect data and send it to the PC for processing. Although the acquisition process of these two data acquisition methods is relatively simple, the measurement sensitivity of the entire optical interference system is not fully utilized, which will bring errors to the final measurement data, and the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V7/04
CPCG01V7/04
Inventor 黄腾超陈傲庞斌车双良舒晓武刘承
Owner ZHEJIANG UNIV
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