Abstract
Ultrasonic thermometer for Phytotron was designed. Block-diagram of this instrument is shown in Fig.2. Received level and phase changes are shown in Fig. 1. Calibration curve of temperature vs. resonance frequency is shown in Fig.4. Characteristic of this instrument is shown in Figs.5 and 6. Measurements of temperature in Phytotron are shown in Figs.9 and 10.
This work was partially supported by the Grantin-Aid from the Ministry of Education.
