A time-correlated computational gravimeter and measurement method

Abstract

A time-correlated calculation gravimeter and measurement method, comprising: a light source, 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 point detector), a coincidence measurement logic module, a delayer and an atomic clock, and the coincidence measurement logic module includes a coincidence measurement logic unit and a calculation unit. By adjusting the delay of the delayer, the logic unit of the measurement conforms to the time measurement logic calculation of the two signals to obtain the delay difference, which is combined with the time at the beginning and end positions recorded by the atomic clock to calculate the gravitational acceleration g. The gravimeter of the invention can effectively reduce measurement errors caused by air disturbance factors, and has the advantages of simple structural design, strong 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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