Precise metal zero-length spring temperature coefficient measuring instrument and method thereof

Abstract

The invention discloses a precise metal zero-length spring temperature coefficient measuring instrument and a method thereof, and relates to a performance testing technology of geoscientific instrument core components. According to the measuring instrument, a shell unit is internally provided with an outer heat insulating layer, an outer constant temperature tank, an inner heat insulating layer, a metal Dewar flask and an inner constant temperature tank from outside to inside; a temperature control system arranged outside the shell unit is connected with the outer constant temperature tank and the inner constant temperature tank; a mechanical sensitive probe unit is arranged in the inner constant temperature tank, and a zero-length spring is arranged in the mechanical sensitive probe unit. The measuring instrument can truly simulate the using environment of the zero-length spring, so that the temperature coefficients of the spring can be more precisely and truly measured; the repeatability rate is high, the stability is good and the interference from outside environment is extremely small; the human intervention is less, and the measurement efficiency is improved; the measuring instrument is suitable for measurement of precise metal zero-length spring temperature coefficients.

Description

technical field [0001] The invention relates to performance detection technology of core components of geoscience instruments, in particular to a precision metal zero-length spring temperature coefficient measuring instrument and a method thereof. Background technique [0002] Accurately measuring the acceleration of gravity and its variation plays an important role in the fields of resource exploration, national defense construction and earth science research. High-precision elastic components are now widely used in precision instruments, meters and precision machinery, among which metal zero-length springs are successfully used in gravimeters to accurately measure the acceleration of gravity. The metal zero-length coil spring produced by special processing technology has relatively small size and high sensitivity, can overcome the lateral disturbance of dynamic measurement, and has a very small amount of creep relaxation. It is an ideal elastic element for gravity measurem...

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Problems solved by technology

In recent years, researchers from the Institute of Surveying and Geophysics, Chinese Academy of Sciences have done systematic research on the development of metal zero-length springs, and their comprehensive properties such as creep and zero drift have also met the design requirements, but the temperature coefficient of zero-length springs The measurement is always at a relatively primitive level, and its measurement method is limited to using the air conditioner to control the temperature change, using an optical vertical altimeter with a reading accuracy of micron level to read the spring length change, and then calculate the result with the least square method for the obtained data. Although the method is simple, it has disadvantages such as large measurement error, high randomness, and unreliable measurement data. The measurement device and measurement method for the temperature coefficient of the zero-length spring are currently the weak links that limit its wide application in China.

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