Optical waveguides – Miscellaneous
Patent
1998-01-20
1999-08-03
Ngo, Hung N.
Optical waveguides
Miscellaneous
374 17, 374208, 385 12, 385 73, G02B 626
Patent
active
059335653
ABSTRACT:
The melting point of a test substance is determined by placing it in a capillary tube within a heated block. The temperature of the block and sample are gradually increased using an electrical heater. The output of a light emitting diode or solid state laser is coupled into an optical fiber that carries the radiation to the capillary tube containing the test substance. A second fiber that is connected to a detector collects radiation from the capillary tube. At the melting point of a solid, or possibly at the boiling point of a liquid, the light scattering and transmissive properties of the test substance change causing the light signal collected by the second fiber to change. The phase transition point is recorded as a change in the output voltage from the detector. The melting point detector is equipped with a number of ports for capillary tubes, fibers, light emitters and detectors so that many phase transition points of different samples can be determined in one heating cycle. The outputs from the detectors are input to a computer and the detector signals are correlated with the temperature of the block.
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Digimelt Inc.
Ngo Hung N.
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