Thermal measuring and testing – Temperature measurement – Temperature distribution or profile
Patent
1989-08-08
1992-11-17
Shoap, Allan N.
Thermal measuring and testing
Temperature measurement
Temperature distribution or profile
374141, 374166, G01K 102, G01K 714, G01K 300
Patent
active
051637545
ABSTRACT:
A sensing system is provided for determining the bed temperature profile of the bed of a stirred, fixed-bed gasifier including a plurality of temperature sensors for sensing the bed temperature at different levels, a transmitter for transmitting data based on the outputs of the sensors to a remote operator's station, and a battery-based power supply. The system includes an isolation amplifier system comprising a plurality of isolation amplifier circuits for amplifying the outputs of the individual sensors. The isolation amplifier circuits each comprise an isolation operational amplifier connected to a sensor; a first "flying capacitor" circuit for, in operation, controlling the application of power from the power supply to the isolation amplifier; an output sample and hold circuit connected to the transmitter; a second "flying capacitor" circuit for, in operation, controlling the transfer of the output of the isolation amplifier to the sample and hold circuit; and a timing and control circuit for activating the first and second capacitor circuits in a predetermined timed sequence.
REFERENCES:
patent: 3946364 (1976-03-01), Codomo et al.
patent: 3995485 (1976-12-01), Beyer et al.
patent: 4466747 (1984-08-01), Fasching
patent: 4699519 (1987-10-01), Persson
patent: 4944035 (1990-07-01), Aagardl et al.
Breeden David E.
Gutierrez Diego F. F.
Hamel Stephen D.
Moser William R.
Shoap Allan N.
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