Optical pyrometer with at least one fibre
First Claim
1. An optical pyrometer for measuring the temperature of a target object (C) having a temperature not greater than about 500°
- C. and producing IR radiations, said pyrometer comprising;
at least one optical fiber (10) transparent to IR, made of fluoride glass and having an entrance end, directed toward said target object (C) and positioned to receive at least a part of the IR radiation flux produced by said target object (C), and an exit end through which said part of the IR radiation flux received by said entrance and emerges;
a reference emitter (20) for emitting a reference IR flux and which is located near said optical fiber exit end;
an infra-red detector (30), sensitive to impinging IR fluxes emerging from said optical fiber exit end and emitted by said reference emitter (20), and adapted to receive said fluxes and to produce an output signal commensurate with the impinging fluxes;
a mechanical modulator (40) positioned, in the direction of propagation of said fluxes from said optical fiber exit end and from said reference emitter, upstream of said detector, and adapted to periodically and successively interrupt the IR flux, emerging from said optical fiber exit end, and the IR flux originating from said reference emitter (20), and to produce a servocontrol signal;
electronic means (50), connected to both said detector (30) and said mechanical modulator (40), to receive their respective output and servocontrol signals to ensure a synchronous detection; and
a measuring apparatus (60), connected to said electronic means (50), for indicating the temperature of the target object (C) irradiating the optical fiber entrance end.
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Accused Products
Abstract
The pyrometer includes at least one optical fibre (10) transparent to infra-red made of fluorite glass, a reference emitter (20) of infra-red flux, an infra-red detector (30) for receiving the infra-red flux emerging from the optical fibre (10) or the infra-red flux originating from the reference emitter (20), a mechanical modulator (40) for infra-red flux positioned, in the direction of flux propagation, upstream of the infra-red detector (30) for periodically and successively interrupting the infra-red fluxes emerging from the optical fibre (10) and originating from the reference emitter (20), an electronic means of demodulation (50) for receiving the output signal from the detector (30) and a servo-control signal emitted by the mechanical modulator (40) in order to ensure a synchronized measurement, and a measuring apparatus (60) connected to the electronic demodulation means (50) for indicating the temperature to be measured of the target irradiating the optical fiber.
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Citations
7 Claims
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1. An optical pyrometer for measuring the temperature of a target object (C) having a temperature not greater than about 500°
- C. and producing IR radiations, said pyrometer comprising;
at least one optical fiber (10) transparent to IR, made of fluoride glass and having an entrance end, directed toward said target object (C) and positioned to receive at least a part of the IR radiation flux produced by said target object (C), and an exit end through which said part of the IR radiation flux received by said entrance and emerges;
a reference emitter (20) for emitting a reference IR flux and which is located near said optical fiber exit end;an infra-red detector (30), sensitive to impinging IR fluxes emerging from said optical fiber exit end and emitted by said reference emitter (20), and adapted to receive said fluxes and to produce an output signal commensurate with the impinging fluxes; a mechanical modulator (40) positioned, in the direction of propagation of said fluxes from said optical fiber exit end and from said reference emitter, upstream of said detector, and adapted to periodically and successively interrupt the IR flux, emerging from said optical fiber exit end, and the IR flux originating from said reference emitter (20), and to produce a servocontrol signal; electronic means (50), connected to both said detector (30) and said mechanical modulator (40), to receive their respective output and servocontrol signals to ensure a synchronous detection; and a measuring apparatus (60), connected to said electronic means (50), for indicating the temperature of the target object (C) irradiating the optical fiber entrance end. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- C. and producing IR radiations, said pyrometer comprising;
Specification