Unstable environment transient-state temperature measuring device based on coarse and fine two-stage light splitting structure

Abstract

The invention discloses an unstable environment transient-state temperature measuring device based on a coarse and fine two-stage light splitting structure. The temperature measuring device comprises a front optical mechanism, a conducting fiber, a light splitting mechanism and a signal acquiring and processing module. The front optical mechanism transmits a spectrum sent by a target to the light splitting mechanism via the conducting fiber. The light splitting mechanism separates, extracts and sends characteristic spectrum signals to the signal acquiring and processing module. The signal acquiring and processing module generates voltage signals corresponding to strength of the characteristic spectrum signals, and analyzes the voltage signals based on the excitation temperature algorithm mathematic model and the radiation temperature algorithm mathematic model so as to obtain the transient-state temperature of a to-be-measured object. According to the invention, the temperature measuring device is capable of extracting characteristic spectrums of various kinds of elements in a wide spectral region and precisely measures the temperature of the target in the unstable and harsh environment with strong electromagnetic radiation and vibration and rapid temperature change.

Description

technical field [0001] The invention belongs to the field of optical precision testing, and in particular relates to a device for measuring transient temperature in an unsteady environment based on a coarse-fine secondary light splitting structure. Background technique [0002] In many fields such as industrial production and medical treatment, temperature detection is involved. In many cases, the temperature does not remain constant. On the contrary, it changes rapidly with time. The temperature in this case is the transient temperature. Real-time monitoring of transient temperature is an important means to keep abreast of the real-time working state inside the system and the interaction of various parameters. [0003] At present, temperature measurement is classified according to the principle, which can be divided into two categories: contact temperature measurement and non-contact temperature measurement. [0004] The contact temperature measurement method is mainly to ...

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Problems solved by technology

However, there are two defects in the two-color method: 1. The positioning and extraction resolution of the characteristic spectrum is not high, and the two extracted working wavelengths have a wide range, which greatly affects the measurement accuracy; 2. There are few wavelength channels, and only two wavelengths are set up. The channel extracts two working wavelengths, the introduced intensity and temperature equations are too few, the calculation and fitting accuracy is too low, and it is difficult to guarantee the final measurement accuracy

The three-color temperature measurement method requires fewer optical paths and optical components, but when it is working, it must provide a channel for the transmission of the thermal radiation spectrum. Some harsh factors in the test environment, such as the influence of smoke and burning ash, will cause Local contamination of this channel results in reduced transmittance uniformity, which reduces the accuracy of temperature measurement

The disadvantage of this device is that the pre-optical mechanism that acts as a probe is integrated with the precision measurement part composed of the grating beam splitting mechanism and the signal processing system. During the actual measurement, the vibration generated at the test site will cause the The attitude and position of the optical components of the adjusted spectroscopic mechanism change, which affects the accurate extraction of the characteristic spectrum; the unfavorable factors such as electromagnetic radiation and temperature changes on the test site will cause interference to the photodetection device of the signal processing system, so that it cannot be used in a single Working in a stable state will bring large accidental errors to the measurement results

The device uses a common reflective blazed grating and two spherical mirrors to form a C-T type spectroscopic mechanism. The disadvantage is that the diffraction efficiency of the reflective blazed grating can only reach about 75%, and the energy utilization rate of the target spectrum is not enough, which will make the final collected The characteristic spectrum signal of the target is too weak, which increases the difficulty of its detection; in addition, due to the large aberration when using the spherical mirror for collimation and focusing, the size of the diffuse spot of each characteristic spectrum on the receiving target surface is relatively small. Large, if the wavelengths of two adjacent characteristic spectra are relatively close, the positions of their diffuse spots will also be very close to each other, and even the overlapping of diffuse spots of different characteristic spectra may occur, resulting in the failure to extract the characteristic spectra

Therefore, due to the size limitation of the second spherical mirror in the spectroscopic mechanism, this system structure can only separate and extract the characteristic spectral lines of some elements in a narrow wavelength range, which limits the scope of its measurement objects

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