Measuring and testing – Volume or rate of flow – Thermal type
Patent
1974-11-26
1976-11-02
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Thermal type
G01F 168
Patent
active
039889289
ABSTRACT:
A device for monitoring and/or measuring the flow velocity of a flowing fluid comprises temperature sensing means adapted for location in said flowing fluid. The sensing means comprises two identical monolithic semiconductive crystals (integrated circuits) each arranged in a heat conducting case. Each crystal contains a number of series connected diode paths serving as temperature sensors. One of the crystals in addition includes a heating member, such as a semiconductor device having a diode, transistor or Zener diode characteristic with a low temperature coefficient. A constant voltage is supplied to said heating member thereby developing constant power, and thus a constant temperature rise, in said one crystal over a large temperature range. Means are arranged for supplying current in the forward direction in the two diode paths, and a comparison circuit is connected to the diode paths for comparing the currents therein, whereby the flow velocity may be determined.
REFERENCES:
patent: 2648224 (1953-08-01), Phillips et al.
patent: 2696739 (1954-12-01), Endres
patent: 3400582 (1968-09-01), Warner
patent: 3680377 (1972-08-01), Lightner
patent: 3733897 (1973-05-01), Herzl
patent: 3780585 (1973-12-01), Milo
patent: 3815113 (1974-06-01), Welch
patent: 3882728 (1975-05-01), Wittlinger
Edstrom Lennart
Uddin Kent
AB Elektronik-Konstruktioner
Goldstein Herbert
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