Method and means of rapidly distnguishing a simulated diamond fr

Details Method and means of rapidly distnguishing a simulated diamond fr Method and means of rapidly distnguishing a simulated diamond fr

1981-03-03

1982-12-21

Goldstein, Herbert

Thermal measuring and testing

Determination of inherent thermal property

Thermal conductivity

G01N 2518

Patent

active

043646778

ABSTRACT:
A simulated diamond such as crystalline cubic zirconia, which has optical properties very similar to natural diamond and so is difficult to distinguish optically from natural diamond, is distinguished from natural diamond by measuring its thermal conductivity which is significantly different from the thermal conductivity of natural diamond, by measuring the temperature of a heated probe held against the simulated diamond as an indication of the simulated diamond thermal conductivity. In a preferred embodiment of the present invention, a controlled amount of heat energy is generated at the probe and thereafter, while the probe is held against the simulated diamond, the temperature of the probe is detected as a measure of relative thermal conductivity of the simulated diamond to the natural diamond.

REFERENCES:
patent: 2330599 (1943-09-01), Kuehni
patent: 2951360 (1960-09-01), Sampson et al.
patent: 3611786 (1971-10-01), Schorr
patent: 3668927 (1972-06-01), Howell et al.
Schulte "A Pulsed Thermal Comparator for the Measurement of Thermal Conductivity", in Proceeding of the 9th Conf. on Thermal Cond., 10/69, pp. 589-598.
Powell et al., "An Instrument Embodying the Thermal Comparator Technique for Thermal Conductivity", 1969.
Lafayette Instrument Company, "Operation and Maintenance for TC-100 Thermal Comparator".

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