Measuring and testing – Gas content of a liquid or a solid – By vibration
Patent
1977-03-08
1978-09-19
Goldstein, Herbert
Measuring and testing
Gas content of a liquid or a solid
By vibration
G01N 2506
Patent
active
041144210
ABSTRACT:
An apparatus is disclosed for measuring the concentration of impurities within a substance by the measurement of the reduction in freezing point of the substance. A container containing the substance is coupled to a temperature variation means such as a solid state thermoelectric device for cooling the substance within the container. A temperature sensor such as a thermistor is mounted in thermal contact with the substance for providing a temperature sensor output in accordance with the temperature of the substance. A first amplifier is connected to the temperature sensor for providing a first amplifier output in relation to the output of the temperature sensor. A second amplifier is connected for receiving the first amplifier output to provide a second amplifier output. Control means receives the second amplifier output for controlling the thermoelectric device in accordance with a preselected standard or program. The control means may be programmed for cooling the substance at a pre-established rate of temperature change. A third amplifier is connected for receiving the first amplifier output for providing a precision third amplifier output for indicating the precise concentration of impurities within the substance. A sample and hold and timing circuit may be included to receive the third amplifier output for indicating the trend of the concentration of impurities in the substance as a function of time during a continuous chemical process.
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Taylor, "Op-Amp Scale Expander etc." in Electronic Design, vol. 23, No. 21, p. 94, Oct. 1975.
Baker International Corporation
Goldstein Herbert
Norvell, Jr. William C.
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