Browse Prior Art Database

Pneumatic to Electric Transducers

IP.com Disclosure Number: IPCOM000097441D
Original Publication Date: 1962-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Akmenkalns, IG: AUTHOR [+3]

Abstract

These transducers provide electrical output signals denoting the logic state of a fluid amplifier type of logic device 1. In such a device, as a high energy fluid power stream leaves an inlet 2, it is selectively divertable to an outlet 3 or 4 by supplying a low energy pressure fluid to a control port 5 or 6, respectively.

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Pneumatic to Electric Transducers

These transducers provide electrical output signals denoting the logic state of a fluid amplifier type of logic device 1. In such a device, as a high energy fluid power stream leaves an inlet 2, it is selectively divertable to an outlet 3 or 4 by supplying a low energy pressure fluid to a control port 5 or 6, respectively.

The temperature-controlled transducer in A uses a temperature sensitive diode 7 disposed in the outer wall of outlet 4. Diode 7 preferably is of the thin film type, evaporated on glass or another insulating type of substrate to provide a small mass and hence rapid response. In B, diode 7 is a reversely biased PN junction connected to the base of an NPN transistor 8 of the grounded emitter type.

When the power stream is discharging from outlet 3, diode 7 heats up. Diode 7 is air cooled when the stream discharges from outlet 4. The reverse leakage current of diode 7 is a sensitive function of temperature, as indicated by the curves in C. These denote the leakage current during discharge from outlet 3 and outlet 4. L denotes the load line of the base-emitter circuit of transistor 8, which is considered as a load for flow-sensing diode 7.

The arrangement shown in D differs by employing pressure sensitive resistors 10 and 11. Thus, when the power stream is discharging from outlet 3, pressure is applied to resistor 10 to reduce its resistivity below that of resistor 11. Hence, transistor 12 assumes its normal or off...