Humidity measuring device and a heat cooker employing the device

Details Humidity measuring device and a heat cooker employing the device Humidity measuring device and a heat cooker employing the device

1996-09-30

1997-11-18

Brock, Michael

Measuring and testing

Gas analysis

By vibration

73 2406, 73 2905, 99342, 219707, G01N 2902

Patent

active

056890605

ABSTRACT:
A highly reliable, accurate humidity measuring device which detects differences in humidity between datum air and measuring air as a time or a phase difference in the propagation velocity of sonic waves, using sonic wave generating and receiving means, and processes this difference using circuitry to provide the humidity condition in the air being tested. Also an oven or heating cooker is disclosed equipped with the humidity measuring device so that it can detect the cooking condition of food by measuring temperature changes due to the steam generated from the food and then using the humidity measuring device to determine when to shut off the heat source of the oven.

REFERENCES:
patent: 3839616 (1974-10-01), Risman
patent: 3848457 (1974-11-01), Behymer
patent: 4255964 (1981-03-01), Morison
patent: 4520654 (1985-06-01), Terhune
patent: 4831239 (1989-05-01), Ueda
patent: 4864088 (1989-09-01), Hiejima et al.
patent: 4876889 (1989-10-01), Shakkottai et al.
patent: 5060507 (1991-10-01), Urmson et al.
patent: 5387254 (1995-02-01), Matsushima

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