초록 ▼

A pyrometer having at least two detectors and at least two band-pass filters near each to limit the detectable wavelength band emitted by an object, and a device to exchange their filters to eliminate detector output ratio errors. The detector output ratio is then used to derive the color temperatur

A pyrometer having at least two detectors and at least two band-pass filters near each to limit the detectable wavelength band emitted by an object, and a device to exchange their filters to eliminate detector output ratio errors. The detector output ratio is then used to derive the color temperature of the object, which may have fast changes in emission intensity output.

대표청구항 ▼

What is claimed is: 1. A pyrometer comprising: a first detector for sensing radiation from a source external to the pyrometer; a second detector for sensing radiation from the source external to the pyrometer; a first filter situated between the first detector and the source; a second filter situat

What is claimed is: 1. A pyrometer comprising: a first detector for sensing radiation from a source external to the pyrometer; a second detector for sensing radiation from the source external to the pyrometer; a first filter situated between the first detector and the source; a second filter situated between the second detector and the source; and a mechanism that can switch the first filter and second filter or replace the first filter or second with a filter from a plurality of filters; and wherein the radiation is sensed through the first and second filters by the first and second detectors at different wavelengths; the first and second detectors provide outputs to a processor; and the processor provides a measurement of a color temperarure of the source from a ratio of the outputs. 2. The pyrometer of claim 1, wherein the radiation source is approximately at one temperature during detection of the radiation by the first and second detectors that provide outputs. 3. The pyrometer of claim 2, wherein: the radiation is black emission of a gaseous emission; and a slope of the black emission is determined from the outputs of the first and second detectors. 4. A pyrometer comprising: a first detector for sensing an emission from a source external to the pyrometer; a second detector for sensing an emission from the source; a first filter situated between the first detector and the source; and a second filter situated between the second detector and the source; and wherein: the first filter is adjusted from one bandpass wavelength to another bandpass wavelength; and the second filter is adjusted from one bandpass wavelength to another bandpass wavelength. 5. The pyrometer of claim 4, further comprising: a third filter situated between the first and second detectors and the source; and wherein the third filter is adjustable between a broadband transmission and no transmission. 6. The pyrometer of claim 5, wherein: the first filter has an optical thickness; the second filter has an optical thickness; the third filter has an optical thickness; a change of optical thickness results in a change of a bandpass wavelength of the respective filter; and each of the first, second and third filters comprises an optical thickness-changing mechanism. 7. The pyrometer of claim 6, wherein the first and second filters alternate between first and second bandpass wavelengths. 8. The pyrometer of claim 7, wherein the third filter alternates between broadband bandpass and no bandpass. 9. The pyrometer of claim 8, wherein the first and second bandpass wavelengths define color temperature of the sensed radiation. 10. The pyrometer of claim 9, wherein each optical thickness-changing mechanism is a thermal actuation of the filters. 11. The pyrometer of claim 9, wherein each optical thickness-changing mechanism is a piezoelectric actuation upon the filters. 12. The pyrometer of claim 9, wherein each optical thickness-changing mechanism is an electrostatic actuation upon the filters. 13. The pyrometer of claim 9, wherein the first, second and third optical filters are Fabry-Perot filters. 14. The pyrometer of claim 9 further comprising a processor connected to the first, second and third detectors, and to the optical thickness-changing mechanisms. 15. The pyrometer of claim 14, wherein: the processor controls the optical thickness-changing mechanisms; and the processor indicates a temperature of the source. 16. The pyrometer of claim 15, wherein the pyrometer is for detecting a temperature of a gas combustor. 17. A pyrometer comprising: a light detector for sensing radiation, from a source external to the pyrometer, along a first axis; and a filter plate positioned between the detector and the source; and wherein: the filter plate is rotatable about a second axis; the second axis is perpendicular to the first axis; and upon each rotation, the filter plate becomes a first narrow bandpass filter between the detector and the source, a broad bandpass filter between the detector and the source, and a second narrow bandpass filter between the detector and the source. 18. The pyrometer of claim 17, wherein: the detector, having the first narrow bandpass filter between the detector and the source, has a first output; the detector, having the second narrow bandpass filter between the detector and the source, has a second output; and the first and second outputs indicate a temperature of the source. 19. A pyrometer comprising: a light detector for sensing radiation, from a source external to the pyrometer, along a first axis; a filter plate positioned between the detector and the source; and second light detector for sensing radiation from the source; and wherein: the filter plate is rotatable about a second axis; the second axis is perpendicular to the first axis; and the filter plate is further positioned between the second detector and the source. 20. The pyrometer of claim 19, wherein upon each rotation, the filter plate becomes a narrow bandpass filter between the second detector and the source, and a broad bandpass filter between the second detector and the source, alternatively. 21. The pyrometer of claim 19, wherein a first bandpass filter is inserted between the detector and the source, a second bandpass filter is inserted between the detector and the source, alternatively. 22. The pyrometer of claim 21, wherein upon each rotation of the filter plate, a third bandpass filter is inserted between the second detector and the source, and a fourth bandpass filter is inserted between the second detector and the source, alternatively. 23. The pyrometer of claim 22, wherein: the first bandpass filter is equivalent to the fourth bandpass filter; the second bandpass filter is equivalent to the third bandpass filter; the first bandpass filter is between the detector and the source at the same time as the third bandpass filter is between the second detector and the source; and the second bandpass filter is between the detector and the source at the same time as the fourth bandpass filter is between the second detector and the source. 24. The pyrometer of claim 23, wherein: the detector has a first output; the second detector has a second output; the first, second, third and fourth filters limit the detectable wavelength band emitted by the source; upon rotation of the filter plate, the first and second outputs are processed as a ratio; and the ratio is processed to derive a temperature of the source. 25. A pyrometer comprising: a first detector having a sensitivity S1; a second detector having a sensitivity S2; a first filter having a transmission TA; a second filter having a transmission TB; and wherein: the first detector, having the first filter situated between the first detector and a source emanating radiation, has an output A 1; the second detector, having the second filter situated between the second detector and the source, has an output B2; the first detector, having the second filter situated between the first detector and the source, has an output B1; the second detector, having the first filter situated between the second detector and the source, has an output A2; a first position comprises: the first filter situated between the first detector and the source; and the second filter situated between the second detector and the source; a second filter position comprises: the first filter situated between the second detector and the source; and the second filter situated between the first detector and the source; a first intensity IA of radiation from the source is proportional to outputs A1 and B2, for the first filter position; a second intensity IB of radiation from the source is proportional to outputs A2 and B1, for the second filter position; I A=A1/(TA쨌S1); and I B=B2/(TB쨌S2). 26. The pyrometer of claim 25, wherein: I' A=A'2/(TA쨌S'2); I' B=B'1/(TB쨌S'1); a symbol with a prime indicates a measurement at a second time; and a symbol with no prime indicates a measurement at a first time. 27. The pyrometer of claim 26, wherein: I +A/I+B˜{(I A/IB)쨌(I'A/I'B)} 0.5={(A1/B2)쨌(A'2 /B'1)}0.5쨌(TB/TA) 쨌{(S'1/S1)쨌(S2/S' 2) }0.5; S1 ˜S2˜S'1S'2 ˜1; and I+A and I+B are the geometric means of two temperature sensor equivalents. 28. A pyrometer comprising: a light detector for sensing radiation, from a source external to the pyrometer, along a first axis; and a filter plate positioned between the detector and the source; and wherein: the filter plate is rotatable about a second axis; the second axis is perpendicular to the first axis; and upon each rotation the filter plate becomes a narrow bandpass filter between the detector and the source, and a broad bandpass filter between the detector and the source, alternatively. 29. A pyrometer comprising: a light detector for sensing radiation, from a source external to the pyrometer, along a first axis; and a filter plate positioned between the detector and the source; and wherein: the filter plate is rotatable about a second axis; the second axis is perpendicular to the first axis; and upon each rotation, the filter plate becomes a narrow bandpass filter between the detector and the source and a zero bandpass filter between the detector and the source.