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특허 상세정보

MyON담기
내보내기 페이스북 공유 카카오톡 공유

Capacitive sensing system and technique

특허상세정보
국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판) G01F-023/26   
미국특허분류(USC) 73/304C ; 324/662 ; 324/663
출원번호 US-0055538 (1993-04-30)
발명자 / 주소
  • Zweifel Ronald A. (Naperville IL)
출원인 / 주소
  • Packard Instrument Company, Inc. (Downers Grove IL 02)
인용정보 피인용 횟수 : 74  인용 특허 : 0
초록
▼

An arrangement senses a liquid level by monitoring the peak capacitance formed between a probe and the liquid as the probe approaches or departs from the liquid. In an automated system, a computer controls the position of a pipette probe for aspirating or dispensing liquid in the vessel. The charge developed via the capacitance on the probe is coupled to a capacitive sensor circuit which provides a peak detector with an amplified signal representing the peak capacitance between the probe and the liquid. This amplified signal is detected by a peak-capacit...

대표
청구항
▼

A capacitive liquid level apparatus, comprising: a probe movably controllable over liquid in a vessel, the probe being constructed and arranged over the liquid to form a capacitance therebetween; a supply circuit coupled to said probe; a capacitive sensor coupled to the probe and arranged to provide an electrical signal representing the capacitance; a peak detection circuit sensing a peak magnitude in the electrical signal; a discrimination circuit providing a hysteresis control signal, the discrimination circuit, responsive to the peak detection circuit...

이 특허를 인용한 특허 (74)

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