Surface Crystalline Carbon Temperature Sensor
During development of instrumentation for a rocket test of the properties of superfluid helium in zero-gravity field, a surface sensor was needed to measure small temperature changes. Requirements of the sensor included high sensitivity, rapid response, small size, reproducibility, and ease of application to a test surface. A sensor formed from a thin film of commercially available carbon colloidal suspension (Electrodag +501)‡ was found to be satisfactory both as a static temperature sensor and as a detector of transient temperature changes. As a static sensor it exhibited an accuracy and reproducibility better than 10 mK. As a transient detector, it was capable of detecting changes of 1 mK with a rise time of 10 msec. These films can also be used as surface heaters with power dissipation of 1 W/cm2 at temperatures as high as 250°C.
KeywordsPower Dissipation Sheet Resistance Surface Sensor Superfluid Helium Performance Film
- 1.G. K. White, Experimental Techniques in Low-Temperature Physics, Clarendon Press, Oxford, England (1968), Chap. IV.Google Scholar