QUALIFICATION TEST REPORT FOR STATHAM ABSOLUTE PRESSURE TRANSDUCER. WEAPON SYSTEM 133A

1963 ◽  
Author(s):  
R. W. Armstrong
Keyword(s):  
Pressure Transducer ◽  
Absolute Pressure ◽  
Weapon System ◽  
Qualification Test ◽  
Test Report

In-phase rejection requirements for measuring respiratory input impedance

1984 ◽  
Vol 56 (3) ◽  
pp. 804-809 ◽  
Author(s):  
R. Peslin ◽  
P. Jardin ◽  
C. Duvivier ◽  
P. Begin
Keyword(s):  
Pressure Difference ◽  
Input Impedance ◽  
Pressure Transducer ◽  
Absolute Pressure ◽  
Impedance Measurements ◽  
Differential Pressure Transducer ◽  
Rejection Ratio ◽  
Respiratory Flow ◽  
In Series ◽  
The Subject

Respiratory flow is commonly obtained by measuring the pressure difference across a pneumotachograph. When respiratory input impedance is studied, that pressure difference may be very small with respect to the absolute pressure swings inside the pneumotachograph. Then the in-phase rejection of the differential pressure transducer is expected to markedly influence the accuracy of the data. The problem was investigated by computer simulation and by measurements on a mechanical analog of the respiratory system made of a resistance, an inertance, and a compliance arranged in series. Both studies demonstrated that comparatively small differences in the volumes of the chambers or in the lengths or diameters of the connecting tubes led to artifactual frequency dependence of resistance and serious misestimation of compliance and inertance. Errors were larger when the resistance of the pneumotachograph was smaller and the impedance of the subject larger. In practice, with usual pneumotachographs accurate impedance measurements require using the most symmetrical transducers presently available (common-mode rejection ratio of about 70 dB at 30 Hz).

scholarly journals Assessing the accuracy of Greenland ice sheet ice ablation measurements by pressure transducer

2012 ◽  
Vol 58 (212) ◽  
pp. 1144-1150 ◽  
Author(s):  
Robert S. Fausto ◽  
Dirk Van As ◽  
Andreas P. Ahlstrøm ◽  
Michele Citterio
Keyword(s):  
Time Series ◽  
Pressure Transducer ◽  
Ice Sheet ◽  
Greenland Ice Sheet ◽  
Ablation Rate ◽  
Absolute Pressure ◽  
Weather Station ◽  
Automatic Weather Station ◽  
Vertical Column ◽  
Physically Based

AbstractWe present a method of measuring ice ablation using an absolute pressure transducer as part of an automatic weather station (AWS) system, which we have installed in 17 locations on the Greenland ice sheet. The pressure transducer assembly is drilled into the ice, enclosed in a hose filled with antifreeze liquid. The pressure signal registered by the transducer is that of the vertical column of liquid over the sensor, which can be translated to depth, and ice ablation rate, knowing the density of the liquid. Measuring at sub-daily timescales, this assembly is well suited to monitoring ice ablation in remote regions, with clear advantages over other, well-established methods. The pressure transducer system has the potential to monitor ice ablation for several years without re-drilling, and the system is suitable for high-ablation areas (>5ma-1). A routine to transform raw measurements into ablation values is presented, including a physically based method to remove air-pressure variability from the signal. The pressure transducer time series is compared to that recorded by a sonic ranger for the climatically hostile setting on the Greenland ice sheet.

Evaluation of a subdural pressure transducer

1972 ◽  
Vol 37 (1) ◽  
pp. 117-121 ◽  
Author(s):  
George T. Tindall ◽  
Charles P. McGraw ◽  
Hans O. Wendenburg ◽  
Herbert H. Peel
Keyword(s):  
Head Injury ◽  
Intracranial Pressure ◽  
Pressure Transducer ◽  
Pressure Gauge ◽  
Practical Method ◽  
Absolute Pressure ◽  
Subdural Space ◽  
Content Type ◽  
Acute Head Injury ◽  
Fine Print

✓ A simple practical method for monitoring intracranial pressure has been developed; it is based on a diaphragm-type, full-bridge, absolute-pressure gauge that is stable. The transducer is calibrated to absolute pressure at body temperature. It is placed in a trephine opening where it is in contact with the subdural space. The transducer is contained in a self-threading case that will fit in a 14 mm trephine opening. Its use in 30 patients with acute head injury is reported.

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