Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1978-09-07
1982-05-11
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
Specific condition
62140, 244134F, G08B 1902
Patent
active
043296823
ABSTRACT:
A method and apparatus is provided for detection of the onset of a physical change in state of a flowing fluid medium or component of a flowing fluid medium, e.g. freezing, boiling, sublimation, crystallization. A surface in contact with the fluid medium is maintained at a temperature that is an approximately fixed amount below or above the general stream temperature of the fluid, by means of a thermo-electric heat pump, the temperature difference being sensed by thermo-couple means to obtain a control signal for regulating the output of an amplifier that drives the heat pump. Upon occurrence of the physical change in state to be detected, the amplifier output will fall or rise rapidly as the system tries to regulate the power input to the pump to keep the temperature difference constant and this swing is detected by a signal generator monitoring the output of the amplifier.
REFERENCES:
patent: 3276254 (1966-10-01), Richard
patent: 3277459 (1966-10-01), Werner
patent: 3305851 (1967-02-01), Brandtszteter
patent: 3367124 (1968-02-01), Beck
patent: 3728867 (1973-04-01), Jarrett
patent: 3782130 (1974-01-01), Irvine
patent: 4007603 (1977-02-01), Gustafsson
Caldwell Sr. John W.
Hawker Siddeley Dynamics Ltd.
Myer Daniel
Rose Howard L.
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