Thermoluminescent reader system
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United States of America Patent
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Sep 16, 2008
Grant Date -
Jun 22, 2006
app pub date -
Dec 20, 2004
filing date -
Dec 20, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A TLD reader system has a laser diode that heats a thermoluminescent material causing a hemispherical photon emission that is collected by a ball lens. A filter ensures the ball lens receives and collects a predetermined transmittance value of the photons emitted within a predetermined range of wavelength. The ball lens sends the collected photons via a fiber-optic connection to a detection module. An infrared sensor senses the temperature and monitors the heating profile of the thermoluminescent material. A computer-controlled feedback loop maintains a constant output power from the laser diode.
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