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Patent Number: |
7425705 |
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Case ID: |
0 |
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Patent Title:
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Thermoluminescent reader system
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Status: |
ACTIVE |
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Status Date: |
2/27/2009 11:31:36 AM |
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Issue Date:
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9/16/2008 |
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Filed Date:
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12/20/2004 |
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Serial #:
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1/017,539 |
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Assignee Name:
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The United States of America as represented by the Secretary of the Army
(Washington,
DC)
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Inventor(s):
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Flournoy, James T. , Harris, Jr., William S. |
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Lab Name: |
Army Aviation & Missile Research, Development & Engineering Center |
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Location: |
AMSRD-AMR-AS-TI
Redstone Arsenal, AL 35898-5000 |
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Contact: |
Contact Lab About This Patent |
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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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What is claimed is:
1. A TLD reader system, comprising: a laser diode for heating a thermoluminescent material; a ball lens for collecting hemispherical photon emissions as a result of said
diode heating said thermoluminescent material; and an infrared sensor for sensing the temperature and monitoring the heating profile of the thermoluminescent material.
2. A TLD reader system according to claim 1, wherein said infrared sensor operates in a different waveband then the emission spectrum of said laser diode.
3. A TLD reader system according to claim 1, further comprising a detector, said detector being fiber-optically coupled to said ball lens.
4. A TLD reader system according to claim 3, further comprising: a filter for ensuring said ball lens receives a predetermined transmittance value of the photons emitted from the thermoluminescent material within a predetermined range of
wavelength.
5. A TLD reader system according to claim 4, fu . . . . More |
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