Browse Prior Art Database

IMPROVED GAUGE HIGH PRESSURE SENSOR

IP.com Disclosure Number: IPCOM000005494D
Original Publication Date: 1983-Mar-01
Included in the Prior Art Database: 2001-Oct-09
Document File: 2 page(s) / 75K

Publishing Venue

Motorola

Related People

Roland Ho: AUTHOR [+2]

Abstract

An improved gauge (differential ambient to unknown) high pressure sensor is disclosed which comprises a heavy metallic diaphragm assembled directly to an upper metallic housing and held in place by a sealing 0 ring and a lower metallic housing. The diaphragm and housing configuration are preferably as shown in the Figure which illustrates a cross section of the present sensor. The diaphragm acts as a displaceable first capacitive electrode and a second fixed posltion capacitive elec- trode is mounted on a lightweight insulating cap. The second electrode output lead is coupled to the second electrode through a primary channel in the insulating cap, and the primary channel and a secon- dary channel provide a pressure path such that ambient pressure will be present in a first cavity formed between the upper housing and the diaphragm with this cavity preferably maintaining ambient pressure. An unknown pressure is applied to a second cavity in the sensor through a pressure inlet and results In predetermined deflection of the diaphragm such that the capacitance between the elec- trodes is altered in accordance with the differential pressure difference between the pressures in cavities I and II.

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MOTOROLA Technical Developments Volume 3 March 1983

IMPROVED GAUGE HIGH PRESSURE SENSOR

By Roland Ho and Rastko Maglic

   An improved gauge (differential ambient to unknown) high pressure sensor is disclosed which comprises a heavy metallic diaphragm assembled directly to an upper metallic housing and held in place by a sealing 0 ring and a lower metallic housing. The diaphragm and housing configuration are preferably as shown in the Figure which illustrates a cross section of the present sensor. The diaphragm acts as a displaceable first capacitive electrode and a second fixed posltion capacitive elec- trode is mounted on a lightweight insulating cap. The second electrode output lead is coupled to the second electrode through a primary channel in the insulating cap, and the primary channel and a secon- dary channel provide a pressure path such that ambient pressure will be present in a first cavity formed between the upper housing and the diaphragm with this cavity preferably maintaining ambient pressure. An unknown pressure is applied to a second cavity in the sensor through a pressure inlet and results In predetermined deflection of the diaphragm such that the capacitance between the elec- trodes is altered in accordance with the differential pressure difference between the pressures in cavities I and II.

   The sensitivity of the pressure sensor is controlled by axially .adjusting the position of the in- sulating cap in the direction A and maintaining this cap in i...