US3619059A
Expired / Lapsed
US
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Color temperature measuring process and apparatus
Assignee: Institut fuer Plasmaphysik GmbH
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Filing: 1969-08-06
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Granted: 1971-11-09
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Expires: 1989-08-06
Abstract
Abstract The color temperature of the radiating body is measured by separately measuring photoelectrically two different wavelength ranges of a beam emanating from the body, while the intensity of the beam is adjusted by an attenuating device so that the two different wavelength ranges are affected substantially the same and one of the wavelength ranges is maintained at a predetermined intensity.
Inventors
- 👤 Peter Muller
- 👤 Ernst Guilino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:28
CPC Classifications
G; G01; G01J; G01J5/00; G01J5/60
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
231 words
An optical pyrometer for measuring the color temperature of a radiating body from the ratio or quotient of the intensity of two different wavelength ranges in a radiation beam emitted from a radiating body, comprising, in combination: a. optical means for receiving radiation from a radiation beam having an intensity and traveling along a path and for forming first and second partial beams having different wavelength ranges of the radiation; b. photoelectric means having sensitivity and responsive to said first and second partial beams for producing first and second output signals related to the intensity of radiation in said first and second partial beams, the output signals being a function of the radiated energy of said partial beams and the sensitivity of said photoelectric means. c. adjustable attenuating means arranged in the path of the radiation for adjusting the intensity of radiation in said partial beams while influencing the radiation in said first and second partial beams substantially to the same extent; d. first control means responsive to the first output signal for controlling the attenuating means for roughly maintaining said first output signal substantially constant; e. second control means connected to said photoelectric means and responsive to said first output signal for controlling the sensitivity of said photoelectric means for finely maintaining said first output signal substantially constant; and f. means for indicating the amplitude of the second output signal.
Claim 2
Dependent Claim
231 words
An optical pyrometer for measuring the color temperature of a radiating body from the ratio or quotient of the intensity of two different wavelength ranges in a radiation beam emitted from a radiating body, comprising, in combination: a. optical means for receiving radiation from a radiation beam having an intensity and traveling along a path and for forming first and second partial beams having different wavelength ranges of the radiation; b. photoelectric means having sensitivity and responsive to said first and second partial beams for producing first and second output signals related to the intensity of radiation in said first and second partial beams, the output signals being a function of the radiated energy of said partial beams and the sensitivity of said photoelectric means. c. adjustable attenuating means arranged in the path of the radiation for adjusting the intensity of radiation in said partial beams while influencing the radiation in said first and second partial beams substantially to the same extent; d. first control means responsive to the first output signal for controlling the attenuating means for roughly maintaining said first output signal substantially constant; e. second control means connected to said photoelectric means and responsive to said first output signal for controlling the sensitivity of said photoelectric means for finely maintaining said first output signal substantially constant; and f. means for indicating the amplitude of the second output signal.
Claim 3
Dependent Claim
38 words
The pyrometer defined in claim 1 wherein said optical means has beam divider means for dividing the radiation beam into said first and second partial beams and filter means for determining the wavelength ranges of the partial beams.
Claim 4
Dependent Claim
28 words
The pyrometer defined in claim 2 wherein said attenuating means has a mechanically adjustable member, and said first control means has a servomotor coupled to adjust the member.
Claim 5
Dependent Claim
22 words
The pyrometer defined in claim 3 wherein said second control means has a substantially shorter time constant than said first control means.
Claim 6
Dependent Claim
26 words
The pyrometer defined in claim 4 wherein the control deviation of said second control means is less than the control deviation of said first control means.
Claim 7
Dependent Claim
64 words
The pyrometer defined in claim 5 wherein said filter means has a filter associated with a respective one of said photoresistors, and further comprising means for pivoting one of said photoresistors and its associated filter out of the path of the respective one of said partial beams, and an ocular into which the beams fall when the photoresistor is pivoted out of the way.
Claim 8
Dependent Claim
21 words
The pyrometer defined in claim 6 wherein said attenuating means is disposed between the radiating body and said beam divider means.
Claim 9
Dependent Claim
27 words
The pyrometer defined in claim 6 wherein said attenuating means includes two attenuating devices coupled to each other and disposed one in each of said partial beams.
Claim 10
Dependent Claim
20 words
The pyrometer defined in claim 6 wherein said beam divider means is a partially permeable mirror and two color filters.
Claim 11
Dependent Claim
35 words
The pyrometer defined in claim 9 wherein said second control means has a bridge circuit, said bridge circuit having one diagonal connected to a constant voltage source and the other diagonal coupled with said servomotor.
Claim 12
Dependent Claim
91 words
The pyrometer defined in claim 9 wherein said second control means has a bridge circuit and said photoelectric means has two photoresistors, said bridge circuit having a photoresistor as one arm, said photoresistor responding to the radiation intensity of one of the said partial beams, said bridge circuit containing in another arm an impedance which is adjustable by means of a setting device calibrated in color temperature degrees, one diagonal of said bridge being connected to an operating voltagE source and the other diagonal being connected to a zero reading meter.
Claim 13
Dependent Claim
17 words
The pyrometer defined in claim 11 wherein said mechanically adjustable member has at least one aperture diaphragm.
Claim 14
Dependent Claim
19 words
The pyrometer defined in claim 11 wherein said mechanically adjustable member has at least one neutrally absorbing structural element.
Claim 15
Dependent Claim
31 words
The pyrometer defined in claim 6 wherein said photoelectric means is at least one secondary electron multiplier and said second control means control operating high voltage of said secondary electron multiplier.
Claim 16
Dependent Claim
97 words
A process for measuring the color temperature of radiating bodies from the ratio or quotient of the radiation energy in two different wavelength ranges of the radiation emitted by the radiator bodies, comprising the steps of: a. attenuating the intensity of a beam emitted by a radiating body to affect two predetermined different wavelength ranges substantially the same; b. maintaining one of the wavelength ranges at a predetermined constant intensity; and c. measuring the intensity of the other of the wavelength ranges to obtain a measured value of intensity which is a measure of the color temperature.
Claim 17
Dependent Claim
97 words
A process for measuring the color temperature of radiating bodies from the ratio or quotient of the radiation energy in two different wavelength ranges of the radiation emitted by the radiator bodies, comprising the steps of: a. attenuating the intensity of a beam emitted by a radiating body to affect two predetermined different wavelength ranges substantially the same; b. maintaining one of the wavelength ranges at a predetermined constant intensity; and c. measuring the intensity of the other of the wavelength ranges to obtain a measured value of intensity which is a measure of the color temperature.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |