Transducer temperature control circuit and method
US4736155A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 6, 1987 |
| Grant date | Apr 5, 1988 |
| Priority date | — |
| Expiry date | Mar 6, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L19/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electronic control circuit for a bridge resistance circuit (10) of a transducer (20) has a switchable source of constant magnitude current (22) to direct current pulses of constant amplitude through the bridge circuit. A temperature setpoint detector (24) generates a temperature signal (TA) to a control logic circuit (26) when the circuit attains a predetermined temperature. The control logic circuit periodically turns on the current and directs a sample and hold network (32) to read the transducer output when the predetermined temperature is reached by enabling a gate (30). The control logic circuit turns off the current by applying a signal to the source of current after a reading of transducer output is taken. The current through the transducer develops its output, heats up the transducer and generates the temperature signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.