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US5300778A
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Multispectral sensor
Assignee: BARTEC MESSTECHNIK und SENSORIK GmbH
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Filing: 1992-10-09
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Granted: 1994-04-05
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Expires: 2012-10-09
Abstract
Abstract The invention relates to a multispectral sensor with several filters and sensor elements for different spectral ranges of a radiation to be measured. The object of the invention is to so further develop a multispectral sensor of this type that it can be manufactured as a discrete component with small dimensions and has a high measuring accuracy, whilst obtaining a high output signal. This object is achieved in that the beam is broken down by an optical device into several partial beams and reflected onto filters. Behind the filters are located radiation-sensitive elements, which detect the spectral range corresponding to the transmission range of the in each case upstream filter. The remaining spectral range of the partial beam is reflected by the filter surface towards the other filters. Thus, each filter is supplied with the associated spectral ranges of all the partial beams.
Inventors
- 👤 Volkmar Norkus
- 👤 Christian Schiewe
- 👤 Frank Nagel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:15
CPC Classifications
G; G01; G01J; G01J5/00; G01J5/60; G01J2005/607
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
102 words
A multispectral sensor with a casing (11), an entrance port (16) for radiation (18) to be measured and located in the casing (11) and an optical device (34) located in the optical path behind the entrance port (16) for dividing up the beam (18) incident through the entrance port (16) into partial beams A, B, a plurality of filters (36a to 36d), which surround the optical device (34) and have different spectral transmission ranges and outside which they have a reflecting construction, and radiation-sensitive elements (38a to 38d) arranged in the optical path of the partial beams A, B behind the filters.
Claim 2
Dependent Claim
102 words
A multispectral sensor with a casing (11), an entrance port (16) for radiation (18) to be measured and located in the casing (11) and an optical device (34) located in the optical path behind the entrance port (16) for dividing up the beam (18) incident through the entrance port (16) into partial beams A, B, a plurality of filters (36a to 36d), which surround the optical device (34) and have different spectral transmission ranges and outside which they have a reflecting construction, and radiation-sensitive elements (38a to 38d) arranged in the optical path of the partial beams A, B behind the filters.
Claim 3
Dependent Claim
26 words
A multispectral sensor according to claim 1, wherein the filters (36a to 36d) are oriented approximately parallel to the optical axis of the incident beam (18).
Claim 4
Dependent Claim
40 words
A multispectral sensor according to claim 1, wherein the optical device (34, 52) has reflecting surfaces inclined relative to one another and which are constructed in highly reflecting manner for the spectral range of the beam (18) to be measured.
Claim 5
Dependent Claim
25 words
A multispectral sensor according to claim 3, wherein the reflecting surfaces are arranged in rotationally symmetrical manner to the optical axis of the beam (18).
Claim 6
Dependent Claim
23 words
A multispectral sensor according to claim 3, wherein the optical device (34) is in the form of a pyramid with a polygonal base.
Claim 7
Dependent Claim
24 words
A multispectral sensor according to claim 5, wherein the number of angles of the base of the pyramid corresponds to the number of filters.
Claim 8
Dependent Claim
22 words
A multispectral sensor according to claim 3, wherein the reflecting surfaces are arranged centrosymmetrically to the optical axis of the beam (18).
Claim 9
Dependent Claim
51 words
A multispectral sensor according to claim 1, wherein the filters (36a to 36d) surround the optical device (34) in such a way that each filter has a high transmission for at least a part of the reflected spectral range of the facing filter (36b) with respect to the optical device (34).
Claim 10
Dependent Claim
35 words
A multispectral sensor according to claim 1, wherein the optical device (34) and the filters (36a to 36d) form the walls of a cage (26) arranged in the optical path behind the entrance port (16).
Claim 11
Dependent Claim
21 words
A multispectral sensor according to claim 9, wherein the cage wall (28) having a beam aperture (30) has a reflecting construction.
Claim 12
Dependent Claim
22 words
A multispectral sensor according to claim 1, wherein the optical device (52) has a plurality of pyramids coated with highly reflecting coatings.
Claim 13
Dependent Claim
19 words
A multispectral sensor according to claim 1, wherein the radiation-sensitive elements (38a to 38d) are constructed as pyroelectric elements.
Claim 14
Dependent Claim
18 words
A multispectral sensor according to claim 1, wherein the filters (36a to 36d) are constructed as interference filters.
Claim 15
Dependent Claim
22 words
A multispectral sensor according to claim 1, wherein the optical device (52) has a plurality of cones coated with highly reflecting coatings.
Claim 16
Dependent Claim
22 words
A multispectral sensor according to claim 1, wherein the optical device (52) has a plurality of hemispheres coated with highly reflecting coatings.
Claim 17
Dependent Claim
23 words
A multispectral sensor according to claim 1, wherein the optical device (52) has a plurality of spherical segments coated with highly reflecting coatings.
Claim 18
Dependent Claim
19 words
A multispectral sensor according to claim 1, wherein the radiation-sensitive elements (38a to 38d) are constructed as vacuum thermocouples.
Claim 19
Dependent Claim
19 words
A multispectral sensor according to claim 1, wherein the radiation sensitive elements (38a to 8d) are constructed as thermopiles.
Claim 20
Dependent Claim
18 words
A multispectral sensor according to claim 1, wherein the radiation-sensitive elements (38a to 38d) are constructed as photodiodes.
References Cited (Backward Citations)
US5041723A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-04-04 | 1997-10-04 | 1998-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-04-04 | 2001-10-04 | 2002-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-04-04 | 2005-10-04 | 2006-04-05 | $7700.00 | Window Closed / Lapsed |