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Title: Apparatus for in-situ calibration of instruments that measure fluid depth

Abstract

The present invention provides a method and apparatus for in-situ calibration of distance measuring equipment. The method comprises obtaining a first distance measurement in a first location, then obtaining at least one other distance measurement in at least one other location of a precisely known distance from the first location, and calculating a calibration constant. The method is applied specifically to calculating a calibration constant for obtaining fluid level and embodied in an apparatus using a pressure transducer and a spacer of precisely known length. The calibration constant is used to calculate the depth of a fluid from subsequent single pressure measurements at any submerged position. 8 figures.

Inventors:
Publication Date:
OSTI Identifier:
5179731
Patent Number(s):
US 5277054; A
Application Number:
PPN: US 7-813339
Assignee:
Battelle Memorial Inst., Richland, WA () PTO; EDB-94-065143
DOE Contract Number:
AC06-76RL01830
Resource Type:
Patent
Resource Relation:
Patent File Date: 23 Dec 1991
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; LEVEL INDICATORS; CALIBRATION; DISTANCE; PRESSURE MEASUREMENT; TRANSDUCERS; MEASURING INSTRUMENTS; 440800* - Miscellaneous Instrumentation- (1990-)

Citation Formats

Campbell, M.D. Apparatus for in-situ calibration of instruments that measure fluid depth. United States: N. p., 1994. Web.
Campbell, M.D. Apparatus for in-situ calibration of instruments that measure fluid depth. United States.
Campbell, M.D. 1994. "Apparatus for in-situ calibration of instruments that measure fluid depth". United States. doi:.
@article{osti_5179731,
title = {Apparatus for in-situ calibration of instruments that measure fluid depth},
author = {Campbell, M.D.},
abstractNote = {The present invention provides a method and apparatus for in-situ calibration of distance measuring equipment. The method comprises obtaining a first distance measurement in a first location, then obtaining at least one other distance measurement in at least one other location of a precisely known distance from the first location, and calculating a calibration constant. The method is applied specifically to calculating a calibration constant for obtaining fluid level and embodied in an apparatus using a pressure transducer and a spacer of precisely known length. The calibration constant is used to calculate the depth of a fluid from subsequent single pressure measurements at any submerged position. 8 figures.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1994,
month = 1
}
  • The present invention provides a method and apparatus for in-situ calibration of distance measuring equipment. The method comprises obtaining a first distance measurement in a first location, then obtaining at least one other distance measurement in at least one other location of a precisely known distance from the first location, and calculating a calibration constant. The method is applied specifically to calculating a calibration constant for obtaining fluid level and embodied in an apparatus using a pressure transducer and a spacer of precisely known length. The calibration constant is used to calculate the depth of a fluid from subsequent singlemore » pressure measurements at any submerged position.« less
  • A new device for measuring the depth of surface tissue burns based on the rate at which the skin temperature responds to a sudden differential temperature stimulus. This technique can be performed without physical contact with the burned tissue. In one implementation, time-dependent surface temperature data is taken from subsequent frames of a video signal from an infrared-sensitive video camera. When a thermal transient is created, e.g., by turning off a heat lamp directed at the skin surface, the following time-dependent surface temperature data can be used to determine the skin burn depth. Imaging and non-imaging versions of this devicemore » can be implemented, thereby enabling laboratory-quality skin burn depth imagers for hospitals as well as hand-held skin burn depth sensors the size of a small pocket flashlight for field use and triage.« less
  • A method and device are disclosed that provide for detection of fluid leaks in analytical instruments and instrument systems. The leak detection device includes a collection tube, a fluid absorbing material, and a circuit that electrically couples to an indicator device. When assembled, the leak detection device detects and monitors for fluid leaks, providing a preselected response in conjunction with the indicator device when contacted by a fluid.
  • A non-destructive method and apparatus which is based on in-situ gamma spectroscopy is used to determine the depth of radiological contamination in media such as concrete. An algorithm, Gamma Penetration Depth Unfolding Algorithm (GPDUA), uses point kernel techniques to predict the depth of contamination based on the results of uncollided peak information from the in-situ gamma spectroscopy. The invention is better, faster, safer, and/cheaper than the current practice in decontamination and decommissioning of facilities that are slow, rough and unsafe. The invention uses a priori knowledge of the contaminant source distribution. The applicable radiological contaminants of interest are any isotopesmore » that emit two or more gamma rays per disintegration or isotopes that emit a single gamma ray but have gamma-emitting progeny in secular equilibrium with its parent (e.g., .sup.60 Co, .sup.235 U, and .sup.137 Cs to name a few). The predicted depths from the GPDUA algorithm using Monte Carlo N-Particle Transport Code (MCNP) simulations and laboratory experiments using .sup.60 Co have consistently produced predicted depths within 20% of the actual or known depth.« less
  • A method is described for generating data indicative of fluid depth in a well, the method comprising the steps of: initiating an acoustic pulse at the top of the well; continuously monitoring the pressure in the well adjacent the top thereof for reflected pulses indicative of acoustic pulse reflections produces by variations in the cross-sectional area of the well; periodically sampling the electrical signal; storing each sample in a memory device; processing the stored samples to generate a velocity estimate of the acoustic pulse; and using the velocity estimate to calculate the well depth from which a selected pulse wasmore » reflected.« less