Thermal measuring and testing – Transformation point determination – By change in optical property
Patent
1996-07-15
1998-06-02
Bennett, G. Bradley
Thermal measuring and testing
Transformation point determination
By change in optical property
374161, G01N 2502
Patent
active
057589682
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.
REFERENCES:
patent: 2669863 (1954-02-01), Shapiro
patent: 2792484 (1957-05-01), Gurewitsch et al.
patent: 3161039 (1964-12-01), Kapff
patent: 3187557 (1965-06-01), Holbourne
patent: 3289460 (1966-12-01), Anderson
patent: 4572676 (1986-02-01), Biermans et al.
patent: 4804274 (1989-02-01), Green
patent: 4925314 (1990-05-01), Claudy et al.
patent: 4927270 (1990-05-01), Bonnard
patent: 5022045 (1991-06-01), Elliott
patent: 5092679 (1992-03-01), Brotz
patent: 5288148 (1994-02-01), Rahimzadeh
Product Brochure Mettler, FP900 Thermal System (undated).
Product Brochure Mettler, FP62 (undated).
Product Brochure Electrothermal, IA2001 Automelt, (undated).
Product Brochure, IA9100, 9200, 9300 "Digital Melting Point Apparatus" (undated).
Bennett G. Bradley
Digimelt Inc.
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