An absolute gravimeter and measurement method based on vacuum optical tweezers

Abstract

The invention discloses an absolute gravimeter and a measurement method based on vacuum optical tweezers. The micro-nano particle release device is equipped with micro-nano particles and is located above the laser optical tweezers. The two beams of captured light in the laser optical tweezers are transmitted through their respective converging lenses and then converge at the intersection. The area where the intersection is located is used as the optical trap capture area. The micro-nano particles It is stably trapped in the optical trap capture area by two beams of captured light; the optical interferometer is electrically connected to the signal processing device, and the optical interferometer measures the displacement of micro-nano particles in real time during the free fall process from the optical trap capture area and sends it to the signal processing device. The signal processing device obtains the measured value of the absolute gravity acceleration through method processing according to the real-time displacement of the micro-nano particles. The invention measures the displacement and time of the micro-nano ball in the process of free fall in real time to realize absolute gravity measurement, eliminates ambient air interference, can realize absolute gravity acceleration measurement, and improves measurement speed and efficiency.

Description

technical field [0001] The invention belongs to an absolute gravity instrument and a measuring method in the technical field of precision measurement, and in particular relates to an instrument and a measuring method for measuring an absolute gravitational acceleration value. Background technique [0002] A gravimeter is a precision instrument used to measure the acceleration of gravity (gravity). It can be widely used in earth exploration, prospecting, surveying and other application fields, and is of great significance to the development of the national economy. The basic measurement principle of the gravimeter is based on Newton's second law, by detecting the free fall time t and distance s of the mass block, and then according to the free fall equation g=2s / t 2 Calculate or fit the measured value g of the gravitational acceleration; if the measured gravitational acceleration is relative, the gravimeter is called a relative gravimeter, and if it measures the absolute magn...

AI Technical Summary

Problems solved by technology

[0005] The existing gravity measurement method mainly uses the method of mechanically releasing the mass block, and uses the reset of the mass block to realize the repeated measurement of gravity. This measurement method has many shortcomings such as complex reset, large volume, and many error factors. However, according to the current optical Technology development, especially in the field of optical force and optical trap, based on the new technology of vacuum optical tweezers based on optical force levitation system, is expected to develop a new absolute gravity measurement technology, improve the measurement accuracy of absolute gravity, and reduce the system At the same time, it realizes the high-precision and fast measurement method of gravity, so as to meet the urgent needs and scientific application requirements for the measurement of the angular velocity of gravity in the fields of inertial navigation, geodetic survey and mineral census.

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