Patent US1031321A successfully refreshed from Google Patents.
US4355898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical detecting, monitoring or measuring arrangements
Assignee: Plessey Overseas Ltd
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Filing: 1980-05-23
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Granted: 1982-10-26
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Expires: 2000-05-23
Abstract
Abstract According to the present invention there is provided an optical detecting, monitoring or measuring arrangement, comprising a movable diffraction grating arranged for angular displacement by means responsive for example to changes in one or more parameters, such as temperature or pressure, whereby the color of light being reflected to a light-receiving point from said grating changes and said light is then directed onto a fixed diffraction grating so that the direction of a light beam consequentially reflected from said fixed diffraction grating changes with change in color, such change in direction being dependent upon and providing an indication of the change in said parameter or parameters.
Inventors
- 👤 John P. Dakin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:00
CPC Classifications
G; G01; G01K; G01K1/00; G01K1/02; G01K1/024; G01K11/00; G01K11/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
103 words
An optical detecting, monitoring or measuring arrangement comprising a movable diffraction grating arranged to have a beam of white light incident thereon and arranged for angular displacement by means responsive to changes in one or more parameters whereby the colour of light being reflected to a light receiving point from said grating changes and said light is then directed onto a fixed diffraction grating so that the direction of a light beam consequentially reflected from said fixed diffraction grating changes with change in colour, said change in direction being dependent upon and providing an indication of the change in said parameter or parameters.
Claim 2
Dependent Claim
103 words
An optical detecting, monitoring or measuring arrangement comprising a movable diffraction grating arranged to have a beam of white light incident thereon and arranged for angular displacement by means responsive to changes in one or more parameters whereby the colour of light being reflected to a light receiving point from said grating changes and said light is then directed onto a fixed diffraction grating so that the direction of a light beam consequentially reflected from said fixed diffraction grating changes with change in colour, said change in direction being dependent upon and providing an indication of the change in said parameter or parameters.
Claim 3
Dependent Claim
126 words
An optical detecting, monitoring or measuring arrangement as claimed in claim 1, wherein the beam of white light arranged to emerge from first optical fibre means is collimated by lens means before being directed onto the movable diffraction grating, the reflected light beam of a colour dependent upon the angular position of the grating being focussed onto one end of further optical fibre means located at said light-receiving point which conveys the coloured light received at said point to a remote location where the coloured light emerging therefrom is again collimated by lens means before being directed onto a fixed diffraction grating, the reflected light beam from said fixed diffraction grating assuming a direction dependent upon the colour of the incident light falling on the grating.
Claim 4
Dependent Claim
53 words
An optical detecting, monitoring or measuring arrangement as claimed in claim 2, wherein the reflected light beam from the fixed diffraction grating is focused by lens means to provide a spot of light, the position of which along a measuring device provides an indication of the angular position of the movable diffraction grating.
References Cited (Backward Citations)
US3988671A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-25 | 1986-04-26 | 1986-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-25 | 1990-04-26 | 1990-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-25 | 1994-04-26 | 1994-10-26 | $7700.00 | Window Closed / Lapsed |