Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method and system for free-falling absolute gravity measurement based on double interferometer

A free fall, gravity measurement technology, applied in measurement devices, gravitational field measurement, geophysical measurement and other directions, can solve the problems of falling body yaw, time dependence, coincidence, etc.

Active Publication Date: 2017-01-04
NAT INST OF METROLOGY CHINA
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In addition, high-precision gravity measurement will also be affected by yaw (rotation of the falling body around its own center of mass during the fall process), this phenomenon is because the optical center of the movable prism in the interferometer that is in free fall cannot match the center of mass of the falling body Completely coincident, so the fall will deflect during the fall
This effect is not easily eliminated and is time-dependent, with progressively worsening wear between the falling body and the pallet, introducing systematic errors in the measurement
Usually, the processing method is used to make repeated adjustments so that the optical center of the reflecting prism in the falling body coincides with the center of mass of the falling body as much as possible to reduce the influence of deflection, but this requires high processing methods, and repeated measurements and adjustments are required to process properly. falling body

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and system for free-falling absolute gravity measurement based on double interferometer
  • Method and system for free-falling absolute gravity measurement based on double interferometer
  • Method and system for free-falling absolute gravity measurement based on double interferometer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Such as image 3 Shown is the principle diagram of the free-fall absolute gravity measurement system based on the double interferometer of the present invention, and this embodiment can be combined with image 3 Be explained.

[0044] The free-fall absolute gravity measurement system based on double interferometers is provided with up-and-down symmetrical interferometers. The interferometers include fixed prisms, movable prisms and beam splitters. The interferometers are irradiated by the same frequency laser light sources to interfere respectively; The first and lower movable prisms are arranged in the same falling body, the optical centers of the upper and lower movable prisms are separated by a predetermined distance, and the center of mass of the falling body is located between the two optical centers in the vertical direction.

[0045] Further, the distance between the optical centers of the upper and lower movable prisms is ≤5mm.

[0046] Further, the measuremen...

Embodiment 2

[0049] Using the free-fall absolute gravity measurement method carried out by the above-mentioned measurement system, the system is measured under the condition of vibration isolation or vibration compensation method, or the results of multiple measurements are averaged to eliminate the influence of random ground vibration disturbance; The laser of the same frequency is used to irradiate the upper and lower interferometers at the same time to generate interference respectively, and the data processing of the interfering light signals is carried out to obtain the gravity value g of a single drop. 上 and g 下 , perform multiple drop measurements and calculate the average and The distance ratio between the optical center of the upper and lower movable prisms and the center of mass of the falling body is fitted by using the results of multiple measurements of the same measurement point with the double interferometer; according to the gravity value g of a single drop 上 and g 下 A...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a free-fall absolute gravity measurement system based on double interferometers, which is provided with a vertically symmetrical interferometer, the interferometer includes a fixed prism, a movable prism and a beam splitter, and the laser light source of the same frequency irradiates the interferometer The instruments interfere respectively; the upper and lower movable prisms are arranged in the same falling body, the optical centers of the upper and lower movable prisms are separated by a predetermined distance, and the center of mass of the falling body is located between the two optical centers in the vertical direction. The system can eliminate the impact of the falling body deflection on the measurement accuracy of the absolute gravity of the free falling body. The invention also provides a free-falling absolute gravity measurement method based on double interferometers.

Description

technical field [0001] The invention relates to a free-fall absolute gravity measurement method based on double interferometers, and also relates to a free-fall absolute gravity measurement system based on double interferometers, which belongs to the field of high-precision absolute gravity measurement. Background technique [0002] Accurate gravity value g is of great significance in the fields of geodesy, geophysics and precision metrology. At present, most countries in the world use the "free fall" method to measure absolute gravity. The measurement principle is to measure the time and distance experienced by the falling body in the process of free falling in the vertical direction in a high vacuum environment. According to Newton's second The law calculates the value of gravity g. [0003] The classic free-fall absolute gravity measurement system uses rubidium (or cesium) atomic frequency standard as the time measurement standard, uses high-stability laser as the length...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01V7/14
Inventor 冯金扬
Owner NAT INST OF METROLOGY CHINA
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com