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High-precision temperature measurement method based on weakly measured dynamic range of pump light modulation

A dynamic range and temperature measurement technology, which is applied in the direction of measuring heat, physical/chemical change thermometers, thermometers, etc., can solve problems such as detection of noise at the receiving end, low extinction ratio of polarizers, and influence of noise systems, and achieve high-precision temperature The effect of improving measurement and temperature measurement accuracy

Active Publication Date: 2021-06-15
SHANGHAI JIAOTONG UNIV
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Problems solved by technology

On the other hand, noise also has a great influence on the system
Due to the instability of the light source, the low extinction ratio of the polarizer, the influence of the two glasses on which the nematic liquid crystal is installed, the influence of the noise floor of the detector and the influence of the optical fiber, etc., these will cause noise at the detection and receiving end

Method used

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  • High-precision temperature measurement method based on weakly measured dynamic range of pump light modulation
  • High-precision temperature measurement method based on weakly measured dynamic range of pump light modulation
  • High-precision temperature measurement method based on weakly measured dynamic range of pump light modulation

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Embodiment 1

[0046] Aiming at the defects in the prior art, the high-precision temperature measurement based on the weakly measured pump light modulation dynamic range is composed of a phase modulated by the pump light power and a wide range of phase modulators in the post-selection When the temperature range is large, the additional phase can be adjusted, so that the system can be precisely in the high-sensitivity linear working area, and the high-precision adjustable dynamic range can be realized. The temperature measurement; at the same time, the system has also carried out noise analysis, making the measurement results more accurate.

[0047] By improving the accuracy and range of the additional phase selected and introduced, the precise control of temperature measurement with large-scale dynamic changes is realized, and the influence of noise is analyzed in combination with experiments, so as to achieve high-precision temperature measurement. Such as figure 2 As shown, it specifical...

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Abstract

The invention provides a high-precision temperature measurement method based on the dynamic range of weak measurement pump light modulation. Build a set of weak measurement optical experiment platform with pre-selection and post-selection, and introduce additional phase in post-selection, wherein the additional phase is composed of optically pumped liquid crystal and phase adjuster; Extended temperature-controlled liquid crystal composition; adjust the additional phase, select the most sensitive linear working area, and simulate the noise intensity and average frequency according to the linear area; record the initial temperature and the received spectrum at this time, and change the temperature of the liquid crystal of the weak coupling module , to couple the system with the probe, and check whether the system is in the linear working area according to the received spectrum information; collect the received spectrum, calculate the change of its average frequency, deduce the small temperature change value, and calculate the current temperature based on the initial temperature and the temperature change value. temperature. Due to the large adjustment range and high control precision of the additional phase, the system is in the linear region of high sensitivity.

Description

technical field [0001] The invention relates to the technical field of temperature measurement, in particular to a high-precision temperature measurement method based on the dynamic range of weak measurement pump light modulation. Background technique [0002] As an excellent precision measurement method, weak measurement has been widely used in the discovery or confirmation of some physical phenomena and the precise measurement of tiny parameters. The weak measurement consists of a weak coupling of the system and the probe, and two nearly vertical pre-selection and post-selection of the system. The closer the front-back selection is to vertical, the more obvious its amplification effect on the parameters to be estimated will be. Therefore, weak measurement is a scheme that sacrifices the probability of successful selection in exchange for high precision of the parameters to be estimated. [0003] For traditional temperature measurement methods, such as thermocouples and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/00
CPCG01K11/006
Inventor 李洪婧刘苗苗黄靖正曾贵华
Owner SHANGHAI JIAOTONG UNIV
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