Time correlation calculation gravimeter and measurement method

Abstract

The invention relates to a time correlation calculation gravimeter and a measurement method. The time correlation calculation gravimeter comprises a digital micromirror array (DMD), a lens, a controller, a first beam splitter, a stress sensor, a prism to be dropped, a reference prism, a second beam splitter, a CCD or a point detector, a coincidence measurement logic module, a delayer and an atomic clock, wherein the coincidence measurement logic module comprises a coincidence measurement logic unit and a calculation unit. The coincidence measurement logic unit carries out time coincidence measurement logic calculation on two paths of signals through adjusting time delay of the delayer so as to acquire a time delay difference value, and gravity acceleration g is calculated by being combined with moments recorded by the atomic clock at initial and final positions. The gravimeter provided by the invention can effectively reduce a measurement error caused by air disturbance factors, and has the advantages of simple structural design, high realizability and the like.

Description

technical field [0001] The invention relates to a time-correlated calculation gravimeter and a measurement method, which belong to the field of gravity measurement. Background technique [0002] Gravity measurement can be traced back to Galileo's Leaning Tower of Pisa free fall experiment in the 16th century. With the development of quantum mechanics and time-frequency technology, absolute gravity measurement (g, commonly used value 9.81m / s 2 ) accuracy is also constantly improving, and is widely used in many fields such as metrology, surveying and mapping, geology, seismic and resource exploration. [0003] The Italian National Institute of Metrology has developed the IMGC-2 absolute gravimeter, which is a high-precision absolute gravimeter that adopts the principle of throwing up and falling. The research team of Faller, the JILA laboratory in the United States, has developed six JILA-g absolute gravimeters and provided them to the metrology and surveying departments of m...

AI Technical Summary

Problems solved by technology

[0004] At present, there are many high-precision gravimeter schemes that can be realized, but there are various problems in anti-interference and engineering realization.

For example, the gravimeter based on classical optics requires the wider the bandwidth of the light source used, the better, but the line width of the light source will cause dispersion problems, and it is seriously affected by the environment, so it cannot be exposed to the atmospheric environment for measurement; the atomic interference gravimeter has high precision , but in terms of engineering, the maturity is low, the volume is huge and continuous measurement cannot be achieved, so it is necessary to find a new type of gravimeter solution to fundamentally solve this series of problems

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