Magnitude, Consequences, and Correction of Temperature‐Derived Errors for Absolute Pressure Transducers under Common Monitoring Scenarios

2021 ◽  
Author(s):  
Joseph Shannon ◽  
Fengjing Liu ◽  
Matthew Van Grinsven ◽  
Randall Kolka ◽  
Thomas Pypker
Keyword(s):  
Absolute Pressure ◽  
Pressure Transducers

scholarly journals WAVE MEASUREMENT WITH DIFFERENTIAL PRESSURE GAUGES

1984 ◽  
Vol 1 (19) ◽  
pp. 51 ◽  
Author(s):  
Kevin R. Bodge ◽  
Robert G. Dean
Keyword(s):  
Sensor Arrays ◽  
Field Research ◽  
Differential Pressure ◽  
Hf Radar ◽  
Absolute Pressure ◽  
Measuring Instruments ◽  
Army Corps ◽  
Engineering Research ◽  
Pressure Transducers ◽  
Directional Wave

The potential error of estimating the small pressure gradient under a directional wave field through the subtraction or comparison of relatively large total-head signals from adjacent pressure transducers in an array is avoided through the use of differential pressure transducers which measure directly the pressure gradients. A device which utilizes four differential pressure tranducers placed orthogonally about one absolute pressure transducer, (the "DPG"), was developed and field-tested at the U.S. Army Corps of Engineers Coastal Engineering Research Center Field Research Facility, Duck, North Carolina. The first five directional Fourier coefficients of the directional ocean spectra were developed from the DPG data, and although no other in_ situ directional wave monitors were available for comparison, the directional peak determined from the DPG agreed well with simultaneous High Frequency (HF) radar data. The DPG instrument is about one-half the size and less than one-sixth the weight of conventional pressure sensor arrays. The field establishment of the orientation of directional-measuring instruments is also discussed.

scholarly journals Standard absolute pressure transducers MIDA-SA-15-S for vacuum equipment

2021 ◽  
Vol 1799 (1) ◽  
pp. 012039
Author(s):  
Y A Vaskov ◽  
E G Savchenko ◽  
V M Stuchebnikov
Keyword(s):  
Absolute Pressure ◽  
Vacuum Equipment ◽  
Pressure Transducers

scholarly journals Performance Evaluation of Honeywell Silicon Piezoresistive Pressure Transducers for Oceanographic and Limnological Measurements*

2005 ◽  
Vol 22 (12) ◽  
pp. 1933-1939 ◽  
Author(s):  
Vijay Kumar ◽  
Antony Joseph ◽  
R. G. Prabhudesai ◽  
S. Prabhudesai ◽  
Surekha Nagvekar ◽  
...  
Keyword(s):  
Temperature Sensitivity ◽  
Pressure Range ◽  
Effective Means ◽  
Pressure Sensors ◽  
Zero Point ◽  
Full Scale ◽  
Absolute Pressure ◽  
Pressure Transducers ◽  
Temperature Range ◽  
The Mean

Abstract Simultaneous calibrations of three temperature-compensated piezoresistive ruggedized precision “absolute” pressure transducers (Honeywell model PPTR0040AP5VB-BD), which have been designed specially for long-term coastal oceanographic and limnological measurements, have been carried out at four differing temperatures (10°, 20°, 30°, and 40°C) to evaluate their suitability for such applications. The full-scale pressure range of these shallow water absolute pressure sensors is ≈ 2800 hPa (equivalent to water depth of ≈ 18 m). Measurement results have been used to examine the transducers’ performance indicators, such as zero-point offset, accuracy, linearity, hysteresis, temperature sensitivity, and slope. Differing piezoresistive ruggedized precision absolute pressure transducers (PPTRs) exhibited differing zero-point offset values, ranging from 2 to −79 hPa. Temperature sensitivity of zero-point offset was ≈0.3 hPa over the temperature range 10°–40°C. The mean hysteresis over the full-scale absolute pressure range (≈2800 hPa) varied from approximately 2 to 8 hPa over the temperature range 10°–40°C. The slope of the least squares–fitted linear graph (taking the mean of ascending and descending pressures) was close to the ideal value of unity (deviation from 1 over the temperature range 10°–40°C was in the range of −0.001 to +0.005). Linearity was excellent, its mean over the entire pressure range being between ≈ −0.006% and 0.008% of full-scale (FS) over the above temperature range. The worst performance was exhibited at input pressures below ≈1500 hPa. Zero-point offset has played a significant role in deteriorating the accuracy of the PPTR, the mean accuracy (within ≈0.1% and −5%) having been exhibited by those transducers having offsets of 2 and −79 hPa, respectively. The mean accuracy exhibited temperature sensitivity of ≈1% in the range 10°–20°C and negligible sensitivity beyond 20°C. Use of a calibration equation significantly improved the mean static accuracy obtainable from the PPTR, to between −0.04% and 0.01% of FS. Evaluation results have indicated that a suitably calibrated temperature-compensated Honeywell PPTR provides an alternate cost-effective means for pressure measurements for coastal oceanographic and limnological studies.

An Objective Method of Pulse Diagnosis

1987 ◽  
Vol 15 (03n04) ◽  
pp. 147-153 ◽  
Author(s):  
Sook Hyang Yoon ◽  
Yoshihisa Koga ◽  
Isao Matsumoto ◽  
Etsutaro Ikezono
Keyword(s):  
Radial Artery ◽  
Medical Diagnosis ◽  
Absolute Pressure ◽  
Objective Method ◽  
Transient Pressure ◽  
Pulse Diagnosis ◽  
Left Wrist ◽  
Pressure Transducers ◽  
The Absolute ◽  
Pressure Changes

One component of Oriental medical diagnosis is pulse diagnosis. To make this method more objective, three pressure transducers were positioned over the radial artery and the absolute pressure of 50,100 and 150 g as applied at three positions to stimulate the classical pulse diagnosis. The transient pressure changes at the three positions were not equal even when the same absoulte pressure was applied. Pressures were compared in superficial and deep locations, right and left wrist. The largest deflection was consdered as excess and the smallest as depletion in twelve meridians.

Transfer-Function Determination for Infinite-Tube-Probe Pressure Transducers with Application to Turbofan Core/Combuster Noise

2019 ◽  
Author(s):  
Devin K. Boyle ◽  
Brenda S. Henderson ◽  
Lennart S. Hultgren
Keyword(s):  
Transfer Function ◽  
Pressure Transducers ◽  
Infinite Tube

BRL (Ballistic Research Laboratory) Calibration Procedures for Ballistic Pressure Transducers

1988 ◽  
Author(s):  
Charles D. Bullock ◽  
Arpad A. Juhasz
Keyword(s):  
Research Laboratory ◽  
Pressure Transducers ◽  
Laboratory Calibration

Measurement of the Air Pressure for a Rotary Vane Compressor

2003 ◽  
Author(s):  
Yuan Mao Huang ◽  
Sheng An Yang
Keyword(s):  
Frequency Converter ◽  
Air Pressure ◽  
Cover Plate ◽  
Rotary Compressor ◽  
Compression Phase ◽  
Pressure Transducers ◽  
Compressor Rotor ◽  
Two Phases ◽  
Rotary Vane Compressor ◽  
Type Pressure

This study introduces an experimental method that can measure air pressures in the vane segments when a sliding-vane rotary compressor performs suction and compression phases in stable or unstable rotational speeds. When the air pressures of these two phases can be measured, the intake effect of the compressor’s inlet and the seal effect of the vane segments can be evaluated, respectively. Because a frequency converter provides unstable rotational speeds when it controls rotational speeds of a motor with a compressor, an encoder mounted on the output shaft of the motor was applied to record the angular location of the compressor rotor. Two strain gauge type pressure transducers were inserted into the cover plate of the compressor to measure air pressures in the vane segments. Comparing the signals of the encoder with pressure transducers, the air pressures in completions of suction and compression phases could be determined in stable or unstable rotational speeds. The air pressures when the compressor performed suction and compression phases were 99.5 kPa and 153 kPa, respectively, in 1400 rpm. The air pressure when the compressor performed suction phase decreased with the rotational speed faster than 800 rpm. The size or shape of the inlet port of the compressor should be enlarged or modified to provide the suction air pressure without dropping too much. The designed air pressure when the compressor performed compression phase was 244 kPa in 140 rpm, the manufacture precision of the compressor should be increased to decrease leakage.

Method for prolonged ambulatory monitoring of high-amplitude propagated contractions from colon

1991 ◽  
Vol 261 (2) ◽  
pp. G263-G268 ◽  
Author(s):  
M. D. Crowell ◽  
G. Bassotti ◽  
L. J. Cheskin ◽  
M. M. Schuster ◽  
W. E. Whitehead
Keyword(s):  
Bowel Movement ◽  
Anal Verge ◽  
Ambulatory Monitoring ◽  
High Amplitude ◽  
X Ray ◽  
Pressure Transducers ◽  
Peristaltic Activity ◽  
Bowel Prep ◽  
Asymptomatic Individuals ◽  
State Pressure

This study monitored high-amplitude propagated contractions (HAPCs) in ambulating subjects over a 24-h period using a new ambulatory recording system. Twelve healthy volunteers aged 34 +/- 5.96 yr participated. Approximately 12 h after a Colyte bowel prep, a small catheter (OD less than 3 mm), containing three solid-state pressure transducers spaced 5 cm apart, was positioned by flexible sigmoidoscope at 40-50 cm from the anal verge. A battery-operated data recorder sampled the pressure at each port at 1 Hz and stored the values on all ports if any port exceeded 75 mmHg. At the conclusion of the 24-h period, an X-ray was taken to confirm the location of the catheter. Fifty-four percent of all HAPCs preceded a bowel movement by less than or equal to 1 h. Forty-nine percent of all HAPCs occurred within 1 h after a high-fat meal, and 33% occurred within 1 h of morning awakening. Reverse propagated waves, not previously described in the colon, were observed in three individuals. Spontaneous high-amplitude caudally propagated contractions occur 6.9 +/- 1.5 times/24 h in the sigmoid colon in ambulating asymptomatic individuals and are temporally related to defecation and meals. Peristaltic activity is decreased during sleep. This recording technique was reliable and well tolerated in all participants.

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