[특허]Drop detection method and apparatus

Drop detection method and apparatus 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	A61M-005/00
출원번호	US-0678639 (1991-04-01)
발명자 / 주소	Yerlikaya Denis Y. (Des Peres MO) Krohn Randall J. (Ballwin MO)
출원인 / 주소	Sherwood Medical Company (St. Louis MO 02)
인용정보	피인용 횟수 : 91 인용 특허 : 0

초록 ▼

A drop detector circuit and method are provided for a drop detector of the type including a drop chamber and an electro-optical sensor. A photodiode detects drops passing through its optical sensing path, and a capacitor is connected between the photodiode and an amplifier to block the DC component of the diode signal. After amplification, the signal is passed through a low pass filter to further block signals caused by undesirable factors. The cutoff frequency of the low pass filter is controlled by a microprocessor that controls the pump that pumps liquid from the drop chamber.

대표청구항 ▼

In a drop flow detector of the type including a drop chamber, a light source for passing light through said chamber, and a light detector responsive to said light after it has passed through said chamber for producing an electrical output signal related thereto, and circuit means responsive to the output signal of said light detector for determining the existence of drop flow, the improvement comprising: blocking means for blocking the DC component of the output signal of said light detector from transmission to said circuit means; to produce a filtered output signal; means for amplifying said filtered output signal, said amplifying means having a predefined saturation level, the filtered output signal being amplified by said amplifying means to a level that does not saturate the same, said level of amplification being substantially higher than the highest level of amplification which would not produce saturation if said DC component were present; means for generating a control signal, and, lowpass filtering means for blocking frequency components in said light detector output signal having a frequency above a cutoff frequency, said low pass filtering means located between said light detector and said circuit means, said cutoff frequency being variable in response to said control signal, said filtering means having a control input for receiving said control signal which determines said cutoff frequency.

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

내보내기 구분	파일저장 인쇄 메일전송
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메일정보	받는사람 (필수) @ 보내는사람 (선택) @ 제목 내용 KISTI 검색결과 이메일 서비스
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연합인증

Drop detection method and apparatus 원문보기

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Drop detection method and apparatus 원문보기

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연구과제 타임라인

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