| 摘要 |
The temp. measuring device uses the variation of the propagation characteristics of sound or ultrasound waves in gases, in dependence on the temp. The sound or ultrasound waves are propagated along a measuring path provided by a gas-filled capillary (2), with detections of variations in the propagation rate and or the phase. Pref. the capillary (2) has a reflective closure at its far end, with the shound or ultrasound transmitter at the initial end simultaneously acting as the receiver. It may be provided by a glass fibre with an outer dia. of 0.5 mm and an inner dia. of 3 mm.
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