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Machine translation
1. (WO1999042847) IMPEDANCE DETECTION APPARATUS AND METHOD
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1999/042847    International Application No.:    PCT/JP1999/000735
Publication Date: 26.08.1999 International Filing Date: 19.02.1999
IPC:
G01R 27/26 (2006.01)
Applicants: SUMITOMO METAL INDUSTRIES, LTD. [JP/JP]; 5-33, Kitahama 4-chome Chuo-ku Osaka-shi Osaka 541-0041 (JP) (For All Designated States Except US).
MATSUMOTO, Toshiyuki [JP/JP]; (JP) (For US Only).
HIROTA, Yoshihiro [JP/JP]; (JP) (For US Only).
HARADA, Muneo [JP/JP]; (JP) (For US Only).
MIYANO, Takaya [JP/JP]; (JP) (For US Only)
Inventors: MATSUMOTO, Toshiyuki; (JP).
HIROTA, Yoshihiro; (JP).
HARADA, Muneo; (JP).
MIYANO, Takaya; (JP)
Agent: OHTSUKA, Sumie; Yuasa and Hara New Ohtemachi Building, Section 206 2-1, Ohtemachi 2-chome Chiyoda-ku Tokyo 100-0004 (JP)
Priority Data:
10/78244 19.02.1998 JP
10/116357 27.04.1998 JP
10/131736 14.05.1998 JP
Title (EN) IMPEDANCE DETECTION APPARATUS AND METHOD
(FR) APPAREIL DE MESURE D'IMPEDANCES ET PROCEDE ASSOCIE
Abstract: front page image
(EN)An apparatus for detecting an impedance variable in response to a sensed physical amount of a sensor is provided which comprises an impedance-frequency conversion unit and a counter. The impedance-frequency conversion unit converts the sensor impedance to an oscillation signal a frequency of which corresponds to the sensor impedance. The impedance-frequency conversion unit comprises an impedance-voltage converter for providing a voltage corresponding to the sensor impedance, and a Wien bridge oscillator including an element an impedance of which varies in response to the voltage from the impedance-voltage converter, for generating the oscillation signal. The Wien bridge oscillator is capable of generating a square wave signal as the oscillation signal. The counter counts the number of waves (or wave number) of the oscillation signal in a predetermined time period to output a count value which can be handled as a digital signal.
(FR)L'invention porte sur un appareil de mesure d'impédances réagissant à une grandeur physique fournie par un capteur et comprenant un convertisseur impédance fréquence et un compteur. Le convertisseur transforme l'impédance fournie par le capteur en un signal oscillant dont la fréquence est fonction de l'impédance, et un oscillateur à pont de Wien comprenant un élément dont l'impédance varie en fonction de la tension du convertisseur pour produire le signal oscillant. L'oscillateur à pont de Wien peut fournir des oscillations carrées. Le compteur compte le nombre des ondes du signal oscillant pendant une période donnée et produit un décompte pouvant être traité comme signal numérique.
Designated States: AL, AM, AT, AU, AZ, BA, BB, BG, BR, BY, CA, CH, CN, CU, CZ, DE, DK, EE, ES, FI, GB, GD, GE, GH, GM, HR, HU, ID, IL, IN, IS, JP, KE, KG, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MD, MG, MK, MN, MW, MX, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, SL, TJ, TM, TR, TT, UA, UG, US, UZ, VN, YU, ZW.
African Regional Intellectual Property Organization (GH, GM, KE, LS, MW, SD, SZ, UG, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GW, ML, MR, NE, SN, TD, TG).
Publication Language: English (EN)
Filing Language: English (EN)