Measuring and testing – Volume or rate of flow – Thermal type
Patent
1980-02-25
1982-03-16
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Thermal type
G01F 168
Patent
active
043194834
ABSTRACT:
An automated fluid flow measurement system employs two temperature sensitive silicon resistors having tracking temperature coefficients. The resistors have equal impurity concentration but different values of resistance. The first temperature sensitive resistor is employed to measure the temperature of a flowing fluid. The second temperature sensitive resistor is electrically heated to a temperature at a predetermined amount greater than the measured temperature of the fluid. Because the rate of heat transfer from the heated temperature sensitive resistor to the fluid depends upon the rate at which the fluid passes this temperature sensitive resistor, the power required in order to maintain the predetermined temperature difference in the second temperature sensitive resistor is a measure of the flow rate of the fluid. The automated fluid flow measurement system also includes an active self-balancing Wheatstone bridge circuit which automatically applies the required amount of power to the second temperature sensitive resistor in order to maintain the temperature difference and further automatically supplies a signal proportional to this applied power and therefore proportional to the flow rate.
REFERENCES:
patent: 2800018 (1957-07-01), Phillips et al.
patent: 3363462 (1968-01-01), Sabin
patent: 3992940 (1976-11-01), Platzer, Jr.
patent: 4142170 (1979-02-01), Blatter
patent: 4213335 (1980-07-01), Peter et al.
C.GS Datametrics Bulletin 600, pub. 1971, p. 4 & FIGS. 1-3.
Shepard, "A Self-excited, alternating-current constant temperature hot-wire anemometer" in NACA Technical Note 3406, 4/55, pp. 1-6, 19, 23.
Durham, Jr. Kenneth M.
Rehn Larry A.
Tarpley Roy W.
Goldstein Herbert
Heiting Leo N.
Marshall, Jr. Robert D.
Sharp Melvin
Texas Instruments Incorporated
LandOfFree
Method of automated fluid flow measurement does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of automated fluid flow measurement, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of automated fluid flow measurement will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1637028