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Intensity ratio temperature measurement method based on broadband fluorescence spectrum

A technology of fluorescence intensity ratio and fluorescence spectrum, which is applied to thermometers, thermometers, and measuring devices that change physically/chemically, can solve problems such as low precision and low radiation intensity, and achieve simple logarithmic formulas, low cost, and large selection range effect

Active Publication Date: 2016-01-13
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

In the intensity ratio temperature measurement technology, the colorimetric blackbody radiation temperature measurement is based on the continuous blackbody radiation spectrum, but the accuracy is very low due to the low radiation intensity when measuring at low temperatures

Method used

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  • Intensity ratio temperature measurement method based on broadband fluorescence spectrum

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Embodiment Construction

[0017] The technical part of the present invention describes a method of selecting two wavelengths from the band spectrum of the fluorescent material and using their intensity ratio to measure the temperature. The specific implementation process is as follows (using the fluorescent material YAG:Ce 3+ example):

[0018] Step 1. The fluorescent material is placed in a temperature-controllable environment, a laser with a center wavelength of 405nm is selected as the excitation light source, and a fiber optic spectrometer with a measurement range in the visible light band and a resolution of 0.5nm is used as a detection device.

[0019] Step 2. Gradually set and change the ambient temperature of the fluorescent material within the range from room temperature to 450k, and record a series of fluorescent emission spectra at different temperatures, such as figure 1 shown.

[0020] Select a wavelength (550nm) near the peak wavelength of the fluorescence spectrum as the reference wave...

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Abstract

The invention relates to an intensity ratio temperature measurement method based on broadband fluorescence spectrum, which mainly makes use of a phenomenon that an intensity ratio of two wavelengths selected on a broadband fluorescence emission spectrum band varies along with temperature. When the method is used for temperature measurement, two proper wavelengths are selected in an emission spectrum band wavelength range of special broadband fluorescence material, the fluorescence emission intensity ratio of the two wavelengths is calculated, the functional relation between the intensity ratio value and the temperature value is a sensing equation, a fluorescence intensity ratio value at unknown temperature is a sensing signal, and when the signal is inputted to the sensing equation, a to-be-measured temperature value is obtained. The invention provides a new fluorescence intensity ratio temperature measurement method, the method is not limited to use a discrete spectral line emission spectrum for limited several rare earth ions in the traditional fluorescence intensity ratio temperature measurement technology, and thus the fluorescence intensity ratio has a wider selectable range than a temperature measurement sensitive material, and the cost is lower.

Description

technical field [0001] The invention relates to an optical measurement method of temperature, in particular to an intensity ratio temperature measurement method based on broadband fluorescence spectrum. Background technique [0002] Fluorescence thermometry is an emerging technology in the field of temperature sensing. Using the temperature-sensitive properties of fluorescent materials for temperature sensing has the typical advantages of optical measurement technology, such as anti-electromagnetic interference, non-contact, etc. At the same time, the cost of the fluorescent temperature measurement system is relatively low among various temperature optical measurement systems. [0003] The sensitive material used in the common fluorescence intensity ratio (FIR) temperature measurement technology must have two thermally coupled radiation transition excited state levels. Therefore, the sensitive material is a special line spectrum fluorescent material, and the fluorescence sp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/32
Inventor 张巍巍王国耀高益庆何兴道
Owner NANCHANG HANGKONG UNIVERSITY
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