Ultrahigh-precision temperature measurement method

Abstract

The invention discloses an ultrahigh-precision temperature measurement method. According to the temperature measurement method, a pulse fiber laser, a high-precision counting module and a main controlmodule are included. Based on the characteristic that the repetition frequency of a pulse laser changes along with temperature, the temperature is indirectly measured by measuring the repetition frequency of the laser, and the method comprises the following steps: 1) the pulse laser is placed in an environment to be measured, and the repetition frequency of the pulse laser changes along with temperature; 2) the high-precision counting module measures the repetition frequency of the pulse laser and transmits a measured value to the main control module; 3) the main control module controls the laser according to the relational expression of the repetition frequency of the laser along with temperature change. The ultrahigh-precision temperature measurement method is scientific, reasonable andsafe and convenient to use, the high-precision measurement temperature can be obtained through temperature monitoring of the pulse fiber laser, repetition frequency monitoring of the high-precision counting module and data analysis of the main control module, and the measurement precision reaches ten thousandth DEG C or above.

Description

technical field [0001] The invention relates to the technical field of temperature measurement, in particular to a method for ultra-high precision temperature measurement. Background technique [0002] Common temperature measurement methods include expansion thermometry, pressure thermometry, and electrical thermometry. [0003] Expansion thermometry uses geometric quantity (volume, length) as a sign of temperature. The common one is a glass liquid thermometer that uses the change of liquid volume to indicate temperature. The most commonly used liquids are mercury, alcohol, toluene, etc. This temperature measurement method is usually The temperature measurement accuracy is not high. [0004] The pressure thermometry method uses pressure as a sign of temperature. Commonly used are industrial pressure gauge thermometers, constant volume gas thermometers and vapor pressure thermometers at low temperatures. This type of thermometer is suitable for temperature measurements that ...

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Problems solved by technology

[0006] Most of the above temperature measurement methods have low measurement accuracy, and the accuracy is within 0.01°C

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