Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1987-07-30
1989-03-28
Strecker, Gerard R.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
733365, 331 65, 331 66, 340602, 374183, G01W 102, G01R 2702, G01K 716, G01N 2704
Patent
active
048167487
ABSTRACT:
An electronic hygrometer and an electronic thermohygrometer both comprising oscillation means and digital operation processing means. The oscillation means of the hygrometer includes a square-wave pulse signal generator, a humidity sensor connected to the generator and which exhibits characteristics variable with the humidity change of the atmosphere, and a passive element connected to the generator and which forms a time constant circuit with the characteristics of the humidity sensor, the passive element being of a type different from the humidity sensor. The oscillation means produces square-wave pulse signals corresponding to changes in the characteristics of the sensor. The digital operation processing means of the hygrometer counts the frequency of the square-wave pulse signals output from the oscillation means and determines the humidity of the atmosphere on the basis of the counted value. The thermohygrometer further comprises a reference resistance element connected in parallel with the humidity sensor, a temperature sensor connected in parallel with the humidity sensor and the resistance element and which exhibits electric resistance variable with the temperature change of the atmosphere, and switching means which open and close the circuits of the humidity sensor, resistance element, and temperature sensor.
REFERENCES:
patent: 3670243 (1972-06-01), Fougere et al.
patent: 4104619 (1978-08-01), Hesler
patent: 4129833 (1978-12-01), Shibata
patent: 4150573 (1979-04-01), Iinuma et al.
patent: 4662220 (1987-05-01), Laue
Kiuchi Norihiro
Murakami Kenji
Segawa Hideo
Tazawa Isao
Tominaga Chikara
Nippon Mining Co., Ltd.
Soar Corporation
Strecker Gerard R.
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