Optical measurement system for spectral analysis
First Claim
1. An optical measuring device for measuring at least one parameter of an object at a given location, which device comprises:
- a source of incident light which incident light, during a parameter-measuring operation, has a given spectral distribution,a sensor adapted to be positioned at said given location and to emit output light when irradiated by said incident light, the spectral response of said output light to said incident light during a parameter-measuring operation being changed by a change in the parameter to be measured,a light detector adapted to generate an output measuring signal when irradiated, during a parameter-measuring operation, with said output light from said sensor,optical means for transmitting incident light to said sensor and transmitting output light from said sensor to said light detector, andelectronic means for sensing and controlling the temperatures of the light source and the light detector in intervals when the parameter-measuring operation is discontinued.
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Accused Products
Abstract
The invention relates to an optical measuring device for measuring physical or chemical quantities which device employs at least one light source, such as a light-emitting diode, in optical connection with a sensor, the spectral properties of which (e.g. the absorption or luminescence spectrum) are adapted to be changed by the quantity being measured, and at least one light detector (e.g. a photo-diode or a photo-transistor) for receiving the output signal from the sensor. The invention is characterized in that the measuring signal is adapted to be obtained by spectral analysis, and that this spectral analysis is adapted to be performed by varying the spectral distribution of the light source (the light-emitting diode) or maintaining said distribution constant, and/or by varying the sensitivity spectrum of the light detector or maintaining said spectrum constant, and that this control of the emission spectrum and the sensitivity spectrum is adapted to be carried out by a periodic controlling of the temperature of the light source and of the light detector, respectively.
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Citations
20 Claims
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1. An optical measuring device for measuring at least one parameter of an object at a given location, which device comprises:
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a source of incident light which incident light, during a parameter-measuring operation, has a given spectral distribution, a sensor adapted to be positioned at said given location and to emit output light when irradiated by said incident light, the spectral response of said output light to said incident light during a parameter-measuring operation being changed by a change in the parameter to be measured, a light detector adapted to generate an output measuring signal when irradiated, during a parameter-measuring operation, with said output light from said sensor, optical means for transmitting incident light to said sensor and transmitting output light from said sensor to said light detector, and electronic means for sensing and controlling the temperatures of the light source and the light detector in intervals when the parameter-measuring operation is discontinued. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification