Absolute gravimeter based on vacuum optical tweezers and measuring method

Abstract

The invention discloses an absolute gravimeter based on vacuum optical tweezers and a measuring method. Micro-nano particles are arranged in a micro-nano particle release device and are located abovethe laser optical tweezers, two beams of capture light in the laser optical tweezers are converged at an intersection point after penetrating through the respective converging lenses, the area where the intersection point is located serves as an optical trap capture area, and the micro-nano particles are stably captured in the optical trap capture area by the two beams of capture light. An opticalinterferometer is electrically connected with a signal processing device, the optical interferometer measures the displacement of the micro-nano particles in real time in the process that the micro-nano particles freely fall from the light trap capture area and sends the displacement to the signal processing device, and the signal processing device obtains the measurement value of the absolute gravitational acceleration according to the real-time displacement of the micro-nano particles and through processing of the method. According to the invention, the absolute gravity is measured by measuring the displacement and time of the micro-nano small balls in the free falling process in real time, the ambient air interference is eliminated, the absolute gravitational acceleration measurement can be realized, and the measurement speed and efficiency are improved.

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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