Temperature measurement apparatuses and method utilizing the alexandrite effect
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01K-011/00
G01J-005/00
출원번호
US-0713491
(2003-11-14)
발명자
/ 주소
Liu,Yan
출원인 / 주소
Liu,Yan
대리인 / 주소
Wu &
인용정보
피인용 횟수 :
1인용 특허 :
6
초록▼
A method and apparatuses for measuring the temperature of a radiating body utilizing the alexandrite effect. The method includes the steps of generating a mathematical relationship between a hue value and temperature for an alexandrite effect filter, receiving radiation from the radiating body, meas
A method and apparatuses for measuring the temperature of a radiating body utilizing the alexandrite effect. The method includes the steps of generating a mathematical relationship between a hue value and temperature for an alexandrite effect filter, receiving radiation from the radiating body, measuring a spectral power distribution of the radiation, calculating the hue value based on the spectral power distribution, and determining the temperature using the mathematical relationship. To implement the method, the apparatuses include an optical probe, a spectral or calorimetric measurement device, and a computer. The apparatuses can measure the temperature of any radiating body with or without spectral lines in the spectral power distribution, and are particularly advantageous to measure high to ultrahigh temperature for radiating bodies with spectral lines, such as plasma, electric arc, and high temperature flames.
대표청구항▼
What is claimed is: 1. A method for determining the temperature of a radiating body utilizing the alexandrite effect, the method comprising the steps of: receiving radiation from the radiating body; measuring a spectral power distribution of the radiation; filtering the spectral power distribution
What is claimed is: 1. A method for determining the temperature of a radiating body utilizing the alexandrite effect, the method comprising the steps of: receiving radiation from the radiating body; measuring a spectral power distribution of the radiation; filtering the spectral power distribution with an alexandrite effect filter; calculating a hue value based on the measured spectral power distribution; and calculating the temperature based on a predetermined mathematical relationship between the hue angle and temperature of the alexandrite effect filter. 2. The method according to claim 1 wherein the alexandrite effect refers to a color change of a material under a blackbody radiator at different temperatures. 3. The method according to claim 1 wherein the alexandrite effect further refers to a color change of a material under different types of light sources at different color temperature. 4. The method according to claim 1 wherein the alexandrite effect filter comprises any material that shows the alexandrite effect. 5. The method according to claim 1 wherein the spectral power distribution has a wavelength range from ultraviolet radiation (100 nm) to infrared radiation (5,000 nm). 6. The method according to claim 1 wherein the predetermined mathematical relationship is generated by the steps of: measuring a spectral transmittance of the alexandrite effect filter along the direction perpendicular to its surface; calculating hue angle for the alexandrite effect filter under a blackbody at different temperatures in a selected color space; and determining the mathematical relationship between the hue values and corresponding temperatures in the color space in which the hue values are calculated. 7. The method according to claim 6 wherein the mathematical relationship between the hue angle and temperature of the alexandrite effect filter can be generated in any color space. 8. The method according to claim 7 wherein the color space is selected from the group consisting of CIELAB, CIELUV, and CIE(x, y), the CIELAB color space being typically selected due to its uniformity for color perception. 9. The method according to claim 1 wherein the mathematical relationship between the hue angle and temperature of the alexandrite effect filter is generated utilizing the following equations in the CIELAB color space: X=∫ {overscore (x)}(λ)s(λ)P(λ) dλ Y=∫ {overscore (y)}(λ)s(λ)P(λ) dλ Z=∫ {overscore (z)}(λ)s(λ)P(λ) dλ where X, Y, and Z are CIE tristimulus values of the alexandrite effect filter, {overscore (x)}(λ), {overscore (y)} (λ), and {overscore (z)}(λ) are CIE color-matching functions, s(λ) is the spectral power distribution of the radiating body measured, and P(λ) is a spectral transmittance of the alexandrite effect filter used; L*= 116(Y/Yn)1/3-16 a*= 500[(X/Xn)1/3-(Y/Yn)1/3] b*= 200[(Y/Yn)1/3-(Z/Zn)1/3] where L*, a* and b* are coordinates of CIELAB color space, and Xn, Yn, and Zn are the tristimulus values of the measured radiating body; h ab=arctan(b*/a*) where h is the hue angle; T=f (h) where T is the temperature of the radiating body, the temperature being a function of the hue angle h selected from the group consisting of a polynomial function, an exponential function, a logarithmic function, a trigonometric function, and mixtures thereof, wherein the following polynomial equation is typically selected: T=a 0+a1h+a2h2+. . . +anhn where a is a parameter in a polynomial function to the n th power of the hue-angle, wherein large values of n correspond to more accuracy of the polynomial function, n being equal to 3 for small temperature ranges, and n being equal to 6 for large temperature ranges. 10. The method according to claim 9 wherein parameters of the polynomial equation are obtained by regression calculations using data of the hue angle versus temperature. 11. The method according to claim 9 wherein only a long wavelength component of the {overscore (x)}(λ) function is used to calculate the hue angle, the used {overscore (x)}(λ) function having actual values from 510 nm to 760 nm and being zero from 380 nm to 510 nm.
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이 특허에 인용된 특허 (6)
Cashdollar Kenneth L. (Bethel Park PA) Hertzberg Martin (Pittsburgh PA) Litton Charles D. (Pittsburgh PA), Multichannel infrared pyrometer.
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