Fluorescent light temperature sensor
First Claim
Patent Images
1. A fluorescent light temperature sensor, comprising:
- a fluorescent material;
a light projecting element projecting light onto the fluorescent material;
a driving circuit driving the light projecting element;
a light receiving element receiving fluorescent light emitted from the fluorescent material and producing an output signal based on the fluorescent light;
a signal processing circuit generating a temperature signal, for a temperature measurement environment separate from the light projecting element, from the output signal of the light receiving element;
a controlling circuit controlling the driving of the driving circuit through sending a control signal to the driving circuit so as to maintain a uniform intensity for the fluorescent light of the fluorescent material based on the output signal from the light receiving element; and
an evaluating device evaluating the service life of the light projecting element in advance based on a control signal from the controlling circuit,wherein the control signal is based on at least one of an actuation frequency of the controlling circuit and a compensating current provided to the light projecting element.
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Abstract
A fluorescent light temperature sensor for producing a temperature signal from a fluorescent light of an optically stimulated fluorescent material is provided with: an LED for projecting light onto the fluorescent material; a driving circuit for driving the light projecting element; a photo diode for receiving the fluorescent light that is emitted from the fluorescent material; a signal processing circuit for producing the temperature signal from the output signal from the photo diode; and an APC circuit for controlling the driving of the driving circuit so as to maintain a uniform light projecting intensity from the LED based on the output signal of the photo diode.
7 Citations
7 Claims
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1. A fluorescent light temperature sensor, comprising:
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a fluorescent material; a light projecting element projecting light onto the fluorescent material; a driving circuit driving the light projecting element; a light receiving element receiving fluorescent light emitted from the fluorescent material and producing an output signal based on the fluorescent light; a signal processing circuit generating a temperature signal, for a temperature measurement environment separate from the light projecting element, from the output signal of the light receiving element; a controlling circuit controlling the driving of the driving circuit through sending a control signal to the driving circuit so as to maintain a uniform intensity for the fluorescent light of the fluorescent material based on the output signal from the light receiving element; and an evaluating device evaluating the service life of the light projecting element in advance based on a control signal from the controlling circuit, wherein the control signal is based on at least one of an actuation frequency of the controlling circuit and a compensating current provided to the light projecting element. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification