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Drop Detector

IP.com Disclosure Number: IPCOM000091094D
Original Publication Date: 1969-Oct-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Ellenwood, ER: AUTHOR

Abstract

Drops of fluid 11 failing through transparent chamber 10 are detected by detector 15 which clamps around 10 anywhere along its length. Detector 15 includes arms 16 and 17 pivoted at 18 so they can be opened away from each other to fit around 10. Spring 19 normally urges arms 16 and 17 toward each other and provides a clamping force. Light sources 20 and 21, positioned in cavities formed within arms 16 and 17 respectively, confront passageways 22 and 23. The light from 20 and 21 normally impinges upon phototransistors 24 placed in the cavities behind passageways 25. Ambient or stray light does not affect phototransistors 24.

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Drop Detector

Drops of fluid 11 failing through transparent chamber 10 are detected by detector 15 which clamps around 10 anywhere along its length. Detector 15 includes arms 16 and 17 pivoted at 18 so they can be opened away from each other to fit around 10. Spring 19 normally urges arms 16 and 17 toward each other and provides a clamping force. Light sources 20 and 21, positioned in cavities formed within arms 16 and 17 respectively, confront passageways 22 and 23. The light from 20 and 21 normally impinges upon phototransistors 24 placed in the cavities behind passageways 25. Ambient or stray light does not affect phototransistors 24. However, a drop of fluid failing in chamber 10 does defract or modulate the light directed on phototransistors 24 so that they develop changes in signal level which are transmitted via cable 26 to pulse shapers 30. Or 31 passes the outputs of 30 to fire single-shot 32. The output of 32 is connected to advance counter 33 which registers the sensing of drops of fluid.

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