Electrothermal transducer with short time constant
Abstract
The possibility is investigated of obtaining electrothermal transducers (devices which employ conversion of an input electrical signal in a resistive heat source to a heat flux, of the heat flux to the temperature of a working body, and conversion of the latter in a heat sensing element to an output signal) with minimal thermal inertia. The factors limiting the speed of electrothermal transducers are analyzed. A condition is derived for achieving the minimum thermal time constant which holds for any amount of heat release. It is shown experimentally that electrothermal transducers can have thermal time constants on the order of a few microseconds. Through theoretical analysis and experimental measurements of static resistance to heat release, the condition for achieving the maximum thermal time constant is satisfied up to frequencies on the order of 1/MHz given the current level of technology, making it possible to expect the construction of transducers with time constants of 10 to the minus 7th power seconds.
- Publication:
-
USSR Rept Electron Elec Eng JPRS UEE
- Pub Date:
- January 1985
- Bibcode:
- 1985RpEEE.......56B
- Keywords:
-
- Signal Processing;
- Static Characteristics;
- Thermoelectricity;
- Transducers;
- Heat Measurement;
- Heat Transfer;
- Time Constant;
- Electronics and Electrical Engineering