Novel HOM interference theory based gravity instrument

Abstract

The invention provides a novel HOM interference theory based gravity instrument. The instrument comprises an entangled source (1), a delayer (2), a first beam splitter (3), a stress sensor (4), a prism (5) to be dropped, a reference prism (6), a second beam splitter (7), a first detector (8), a second detector (9), a coincidence measurement logic calculator (10), an atomic block (11) and a controller; when in use, the delayer (2) is adjusted to delay to enable destructive interference between the idle light and signal light flowing through the initial position, then the prism (5) to be dropped freely falls down to the end position, the free falling time is recorded, the delayer (2) is adjusted to delay again to enable destructive interference between the idle light and the signal light flowing through the end position, and finally the gravity acceleration can be obtained through the controller according to the difference between two delay, and the difference between the initial time and the end time. According to the instrument, the HOM interference theory is utilized to achieve the high precision measurement of the gravity accelerator; the instrument can be widely applied to the fields of metering, surveying and mapping, physical geography, ocean exploration and space science.

Description

technical field [0001] The invention relates to the field of gravity detection, especially a new type of gravimeter based on the principle of HOM interference, which can realize the measurement of the acceleration of gravity g with high precision, and provides a solution for analyzing the change law of the gravity field, the movement and structure of the earth's crust, and the parameters of the surface gravity field. The experimental data can be widely used in the fields of metrology, surveying and mapping, geophysics, ocean exploration and space science. 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 resourc...

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 resolution improvement and engineering realization.

For example, the gravimeter based on classical optics requires that the bandwidth of the light source used should be as wide as possible, but the line width of the light source will cause dispersion problems; the atomic interference gravimeter has high precision, but in terms of engineering, it is low in maturity, bulky and Continuous measurement cannot be realized. Based on this, the present invention designs a new gravimeter based on the principle of HOM interference. On the one hand, it can overcome the dispersion problem of classical optical gravimeters, and can also realize the measurement of high-precision gravitational acceleration g

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