US4166955A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiation detector and method of operating the same
Assignee: Cerberus AG
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Filing: 1978-03-30
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Granted: 1979-09-04
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Expires: 1998-03-30
Abstract
Abstract A radiation detector having at least one radiation sensitive element with more than two electrical contacts. The effects of noise occurring between pairs of contacts are substantially eliminated by multiplying at least two partial signals appearing between two of the contacts. The detector is particularly suitable for use as a passive infrared detector and as a flame detector.
Inventors
- 👤 Hansjurg Keller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:50
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/42; G01J1/44; G08; G08B; G08B13/00; G08B13/18; G08B13/189; G08B13/19; G08B17/00; G08B17/12
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
101 words
A radiation detector comprising: at least one radiation sensitive element for delivering an electrical signal in accordance with electromagnetic radiation impinging thereat; said radiation sensitive element having more than two electrical contacts; a multiplier device for multiplying at least two partial signals each appearing between two of the contacts; and said multiplier device delivering an output signal if both of said two partial signals are present at the same time and delivering no output signal if at least one of said partial signals is absent, in order to eliminate the effects of noise signals occurring between given pairs of said contacts.
Claim 2
Dependent Claim
101 words
A radiation detector comprising: at least one radiation sensitive element for delivering an electrical signal in accordance with electromagnetic radiation impinging thereat; said radiation sensitive element having more than two electrical contacts; a multiplier device for multiplying at least two partial signals each appearing between two of the contacts; and said multiplier device delivering an output signal if both of said two partial signals are present at the same time and delivering no output signal if at least one of said partial signals is absent, in order to eliminate the effects of noise signals occurring between given pairs of said contacts.
Claim 3
Dependent Claim
16 words
The radiation detector as defined in claim 1, further including: means for amplifying said partial signals.
Claim 4
Dependent Claim
27 words
The radiation detector as defined in claim 1, wherein: said radiation sensitive element comprises a radiation sensitive surface having edge means at which are provided said contacts.
Claim 5
Dependent Claim
33 words
The radiation detector as defined in claim 3, wherein: said radiation sensitive surface has a quadratic shape incorporating four corners; and said contacts being arranged at said four corners and comprising metallic surfaces.
Claim 6
Dependent Claim
35 words
The radiation detector as defined in claim 3, wherein: said radiation sensitive surface has a substantially circular configuration with a substantially circular edge; and said contacts being provided at the region of said circular edge.
Claim 7
Dependent Claim
30 words
The radiation detector as defined in claim 3, wherein: said radiation sensitive surface has a substantially triangular configuration incorporating three corners; and said contacts being provided at said three corners.
Claim 8
Dependent Claim
32 words
The radiation detector as defined in claim 1, wherein: said radiation sensitive element comprises a radiation sensitive surface carrying said contacts which are in the form of at least approximately parallel strips.
Claim 9
Dependent Claim
21 words
The radiation detector as defined in claim 7, wherein: the partial signals are constituted by the signals appearing between neighboring contacts.
Claim 10
Dependent Claim
26 words
The radiation detector as defined in claim 1, wherein: said radiation sensitive element comprises a radiation sensitive surface constituted by photoelectric semiconductor material of a photoresistor.
Claim 11
Dependent Claim
21 words
The radiation detector as defined in claim 1, wherein: said radiation sensitive detector comprises a radiation sensitive surface constituting a thermistor.
Claim 12
Dependent Claim
42 words
The radiation detector as defined in claim 1, wherein: said radiation sensitive element comprises a radiation sensitive body having a blocking layer; and said contacts being arranged at both sides of the blocking layer at outer surfaces of the radiation sensitive element.
Claim 13
Dependent Claim
17 words
The radiation detector as defined in claim 1, wherein: said radiation sensitive element comprises a pyroelectric body.
Claim 14
Dependent Claim
39 words
The radiation detector as defined in claim 1, wherein: said multiplier device is structured for the multiplication of the partial signals such that at the multiplier output there appears a mathematical function of the product of the partial signals.
Claim 15
Dependent Claim
40 words
The radiation detector as defined in claim 1, wherein: said multiplier device has an output and is structured such that the partial signals appear at said output in the form of the logarithm of the product of the partial signals.
Claim 16
Dependent Claim
56 words
The radiation detector as defined in claim 1, wherein: the multiplier device has an output and is structured such that there is delivered at said output an output signal which is dependent upon the product of the input signals in an unambiguous manner when both input signals are between a lower threshold and an upper threshold.
Claim 17
Independent Claim
121 words
A method of operating a radiation detector comprising at least one radiation sensitive element for delivering an electrical signal in accordance with electromagnetic radiation impinging thereat, said radiation sensitive element having more than two electrical contacts, and a multiplication device for multiplying at least two partial signals each appearing between two of the contacts, said multiplication device delivering an output signal if both of said two partial signals are present at the same time and delivering no output signal if at least one of said partial signals is absent, in order to eliminate the effects of noise signals occurring between given pairs of said contacts, including the steps of: utilizing such radiation detector for detecting the inherent radiation of an object.
Claim 18
Independent Claim
121 words
A method of operating a radiation detector comprising at least one radiation sensitive element for delivering an electrical signal in accordance with electromagnetic radiation impinging thereat, said radiation sensitive element having more than two electrical contacts, and a multiplication device for multiplying at least two partial signals each appearing between two of the contacts, said multiplication device delivering an output signal if both of said two partial signals are present at the same time and delivering no output signal if at least one of said partial signals is absent, in order to eliminate the effects of noise signals occurring between given pairs of said contacts, including the steps of: utilizing such radiation detector for detecting the inherent radiation of an object.
Claim 19
Dependent Claim
25 words
The method as defined in claim 16, further including the steps of: utilizing the radiation detector for detecting the flame radiation of a burning object.
Claim 20
Dependent Claim
23 words
The method as defined in claim 16, wherein: said radiation detector is employed for detecting the infrared body radiation of a human being.
Claim 21
Dependent Claim
41 words
The method as defined in claim 18, further including the steps of: utilizing an optical system having discrete receiving regions for modulating the infrared body radiation during movement of the human being and delivering such modulated radiation to the radiation detector.
References Cited (Backward Citations)
US3931515A
Cited
US3848129A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-09-03 | 1983-03-05 | 1983-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-03 | 1987-03-05 | 1987-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-03 | 1991-03-05 | 1991-09-04 | $7700.00 | Window Closed / Lapsed |