High temperature, minimally invasive optical sensing modules
First Claim
1. A remote sensing system comprising:
- a sensor device having known characteristics that vary responsive to changes in a monitored condition;
a first light source for directing a first light beam having a first wavelength at the sensor device;
a second light source for directing a second light beam having a second wavelength different from the first wavelength at the sensor device;
a photo detector for receiving the first light beam and the second light beam from the sensor device and for providing respective sensing signals corresponding to the first light beam and the second light beam received from the sensor device; and
a processor for receiving the respective sensing signals and for determining a condition proximate the sensor device by comparing characteristics of the sensing signals to the known characteristics.
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Accused Products
Abstract
A remote temperature sensing system includes a light source selectively producing light at two different wavelengths and a sensor device having an optical path length that varies as a function of temperature. The sensor receives light emitted by the light source and redirects the light along the optical path length. The system also includes a detector receiving redirected light from the sensor device and generating respective signals indicative of respective intensities of received redirected light corresponding to respective wavelengths of light emitted by the light source. The system also includes a processor processing the signals generated by the detector to calculate a temperature of the device.
15 Citations
37 Claims
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1. A remote sensing system comprising:
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a sensor device having known characteristics that vary responsive to changes in a monitored condition; a first light source for directing a first light beam having a first wavelength at the sensor device; a second light source for directing a second light beam having a second wavelength different from the first wavelength at the sensor device; a photo detector for receiving the first light beam and the second light beam from the sensor device and for providing respective sensing signals corresponding to the first light beam and the second light beam received from the sensor device; and a processor for receiving the respective sensing signals and for determining a condition proximate the sensor device by comparing characteristics of the sensing signals to the known characteristics. - View Dependent Claims (2)
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3. A remote sensing method comprising:
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directing a first light beam having a first wavelength at a sensor device having characteristics that sinusoidally vary responsive to changes in a monitored condition; directing a second light beam having a second wavelength different from the first wavelength at the sensor device; receiving the first light beam and the second light beam from the sensor device; and determining a condition proximate the sensor device by comparing characteristics of the the first light beam and the second light beam received from the sensor device to the known characteristics. - View Dependent Claims (4, 5, 6)
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7. A method for remotely sensing environmental conditions comprising:
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disposing an etalon having known characteristics in an environment in which conditions are to be sensed; directing a light beam at a first frequency and a light beam at a second frequency at the etalon; determining a first phase of the light beam at the first wavelength received from the etalon and a second phase of the light beam at the second wavelength received from the etalon; determining a phase difference between the first phase and the second phase; and determining an environmental condition proximate the etalon by comparing at least one of the first and second phases and the phase difference to the known characteristics. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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Specification