Patent US3745086A successfully refreshed from Google Patents.
CA1115084A
Expired / Lapsed
CA
⏱️ 0.0 years remaining
Optical measuring device using optical fibers
Assignee: ABB Norden Holding AB
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Filing: 1978-11-22
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Granted: 1981-12-29
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Expires: 1998-11-22
Abstract
Abstract ABSTRACT OF THE DISCLOSURE In an optical measuring device for measuring physical magnitudes a sensor is actuated by the physical magnitude to be measured. An optical signal generator and processor provides light signals to the sensor and processes optical output signals transmitted from the sensor. Optical fibers conduct light to the sensor and transmit light signals therefrom to optical detectors. The sensor modulates at least a portion of the light transmitted thereto such that the modulated light output therefrom transmitted to the optic processor contains measuring components representative of the magnitude to be measured and stabilizing component signals independent of the magnitude. The optical processor separates the measuring components and the stabilizing components and generates at least one measuring signal and compensating signals for stabilizing the measuring device.
Inventors
- 👤 Jan Bergstrom
- 👤 Hans Bertilson
- 👤 Torgny Brogardh
- 👤 Anders Persson
Bibliographic Details
Application Number
—
Jurisdiction
CA
Data Source
google_patents
Last Synchronized
2026-10-30 16:06
CPC Classifications
G; G01; G01L; G01L9/00; G01L9/0001; G01L9/0007; G01D; G01D5/00; G01D5/26; G01D5/268; G01J; G01J5/00; G01J5/38; G01J5/42; G01L9/0041; G01L9/0076
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
191 words
Optical measuring device for measuring at least one physical magnitude, comprising: a sensor actuated by the physical magnitude to be measured; means for generating optic input signals to said sensor and for processing optic output signals emanating from said sensor, and including at least one light source and at least two optical detectors; optical fibers for transmitting said input and output signals between said sensor and said means for generating and processing; said sensor including means for modulating at least a portion of the light conducted into said sensor such that the said light output signals from said sensor contains at least one measuring component repro-tentative of the magnitude to be measured and at least one stabilizing component with a smaller dependence on said magnitude than said measuring component; and said means for generating and processing including means for separating said at least one measuring component and said at least one stabilizing component, and generating therefrom at least one measuring signal and at least one compensating signal, and means for using said at least one compensating signal to reduce the dependence of said measuring signal on instabilities in the measuring device.
Claim 2
Dependent Claim
191 words
Optical measuring device for measuring at least one physical magnitude, comprising: a sensor actuated by the physical magnitude to be measured; means for generating optic input signals to said sensor and for processing optic output signals emanating from said sensor, and including at least one light source and at least two optical detectors; optical fibers for transmitting said input and output signals between said sensor and said means for generating and processing; said sensor including means for modulating at least a portion of the light conducted into said sensor such that the said light output signals from said sensor contains at least one measuring component repro-tentative of the magnitude to be measured and at least one stabilizing component with a smaller dependence on said magnitude than said measuring component; and said means for generating and processing including means for separating said at least one measuring component and said at least one stabilizing component, and generating therefrom at least one measuring signal and at least one compensating signal, and means for using said at least one compensating signal to reduce the dependence of said measuring signal on instabilities in the measuring device.
Claim 3
Dependent Claim
74 words
Optical measuring device according to claim 1 including two output signal fibers for transmitting light from said sensor, and said at least one measuring component being transmitted from said sensor to said means for generating and processing by only one of said output signal fibere, and said at least one stabilizing component being trans-mitted from said sensor to said means for generating and processing by the other or both of said output signal fibers.
Claim 4
Dependent Claim
104 words
Optical measuring device according to claim 1 including at least two output signal fibers for transmitting light from said sensor, and wherein each of said output signal fibers transmits at leant one of said measuring and one of said stabilizing components, and wherein said means for generating and processing includes subtraction means for form ing said at least one measuring signal from the difference between the light signals transmitted by said at least two output signal fibers and summation means for generating said at least one compensating signal from the sum of the light signals transmitted by said at least two output signal fibers.
Claim 5
Dependent Claim
102 words
Optical measuring device according to claim 1 including at least two output signal fibers for transmitting light from said sensor, and wherein each of said output signal fibers transmits at least one of said measuring and one of said stabilizing components, wherein said means for generating and processing includes summation means for form-ing said at least one measuring signal from the sum of the light signals transmitted by said at least two output signal fibers, and subtraction means for generating said at least one compensating signal from the difference between the light signals transmitted by said at least two output signal fibers.
Claim 6
Dependent Claim
96 words
Optical measuring device as in claim 1 including at least two output signal fibers for transmitting light from said sensor, and wherein each of said output signal fibers transmits at least one of said stabilizing components, wherein said means for generating and processing further includes subtraction means for forming at least one compensating signal from the difference between said stabilizing components from said at least two output signal fibers, and further comprising means for con-trolling instabilities in the matching between said output signal fibers and associated detectors and electronics in said means for generating and processing.
Claim 7
Dependent Claim
104 words
Optical measuring device as in claim 1 including at least two input signal fibers for conducting light from said at least one light source to said sensors wherein said light sources are modulated with different frequencies, including the frequency 0, and said means for generating and processing comprises filtering circuits for dividing the signals from the output signal fibers, transmitting light signals from the sensor, into at least two light source components, each originating in one of said light sources, and further comprises means for forming said at least one measuring signal and said at least one compensating signal from said light source components.
Claim 8
Dependent Claim
102 words
Optical measuring device as in claim 1 including at least two input signal fibers for conducting light from said at least one light source to said sensor, wherein said light sources are energized during different time intervals and said means for generating and processing comprises sampling circuits for dividing the signals from the output signal fi-bers, which transmit light signals from the sensor, into at least two light source components, each originating in one of said light sources, and further comprises means for forming said at least one measuring signal and said at least one compensating signal from said light source components.
Claim 9
Dependent Claim
52 words
Optical measuring device as in claim 1, further comprising means for compensating for instabilities in said optical fibers, in said at least one light source and in said optical detectors with associated electronics by means of regulating said at least one light source to main-tain said at least one compensating signal constant.
Claim 10
Dependent Claim
50 words
Optical measuring device as in claim 1 further comprising means for compensating for instabilities in said optical fibers, in said at least one light source and in said optical detectors by means of regula-ting said optical detectors and possibly detector amplifiers to maintain said at least one compensating signal constant.
Claim 11
Dependent Claim
116 words
Optical measuring device as in claim 1 including at least two output signal fibers for transmitting light from said sensor, said means for generating and processing including subtraction means for form-ing a compensating signal from the difference between the light signals, transmitted from said at least tow output signal fibers, with respect to stabilizing components originating in one of said light sources, which generates light to one of said fibers, which with a constant relationship, independent of said magnitude, transmits light to said at least two out-put signal fibers, and including means for controlling the sensitivity of said detectors and possibly detector amplifiers in such a way that said com-pensating signal is kept equal to zero.
Claim 12
Dependent Claim
138 words
Optical measuring device as in claim 1 including two input signal fibers for transmitting light to said sensor and two output signal fibers for transmitting signals from said sensor to said means genera-ting and processing and said means for modulating including a screening plate having a transparent field therein for passing light from the first of said input signal fibers to said two output signal fibers on the oppo-site side of said screening plate, whereby movement of said first input signal fiber relative to said output signal fibers generates measuring and stabilizing components in said output signal fibers, and including a mirror or a slit, which with a constant relationship, independent of said movement, transmits light to said two output signal fibers and there-by generating stabilizing components for matching stabilization of said output signal fibers and associated detectors.
Claim 13
Dependent Claim
140 words
Optical measuring device as in claim 1 including two input signal fibers for transmitting light to said sensor and two output signal fibers for transmitting optical signals from said sensor to said means for generating and processing, and said means for modulating including a screen having at least one gap therein extending between said input and output signal fibers and a mirror positioned behind said screen, whereby light reflected from the first of said input signal fibers to said output signal fibers is modulated to generate measuring and stabilizing components when said screen and possibly mirror is moved relative to said input and output signal fibers, and including a light path, for the light from the second of said input signal fibers to said output signal fiber, which is not affected by said movement of said screen and possibly mirror.
References Cited (Backward Citations)
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