Fiber optic temperature sensor using liquid component fiber
First Claim
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1. Remote optical type temperature sensor apparatus comprising:
- a length of multi-mode optical fiber having a core and a cladding for transmitting light therethrough and having an input end adapted to be light excited and an output; and
,a temperature-sensing optical fiber section, positioned at a selected point in the length of optical fiber, the section having a transparent liquid component and a transparent solid component, one of said components comprising a core and the other component a cladding surrounding the core, the transparent solid component having a predetermined index of refraction, the transparent liquid component having a temperature dependent index of refraction so that the light transmitted by said temperature section is a function of sensed temperature.
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Abstract
This invention provides apparatus for remote temperature sensing by means of fiber optics in which the sensor is optical and passive, with no electrical power required at the sensor. The temperature-sensing section of the fiber optic makes use of a transparent liquid as core or cladding and in which the transparent liquid has a temperature-dependent index of refraction.
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Citations
6 Claims
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1. Remote optical type temperature sensor apparatus comprising:
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a length of multi-mode optical fiber having a core and a cladding for transmitting light therethrough and having an input end adapted to be light excited and an output; and
,a temperature-sensing optical fiber section, positioned at a selected point in the length of optical fiber, the section having a transparent liquid component and a transparent solid component, one of said components comprising a core and the other component a cladding surrounding the core, the transparent solid component having a predetermined index of refraction, the transparent liquid component having a temperature dependent index of refraction so that the light transmitted by said temperature section is a function of sensed temperature. - View Dependent Claims (2, 3, 4)
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5. Apparatus for optically sensing temperature comprising:
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means including light producing means and light detecting means; fiber optic temperature sensing sensor means including a transparent liquid component and a transparent solid component, one of said components comprising a core and the other component a cladding surrounding the core, the transparent solid component having a predetermined index of refraction, the transparent liquid component having a temperature-dependent index of refraction; a length of multi-mode optic fiber having a core and a cladding and having a predetermined numerical aperture; and
,an optic loop including said optic fiber optically connecting said light producing means to said light detecting means by way of said sensor means whereby the light travels through said optic fiber and sensor means to reach said light detecting means. - View Dependent Claims (6)
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Specification