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

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.
Authors:
 [1]
  1. (Richland, WA)
Publication Date:
OSTI Identifier:
869116
Report Number(s):
US 5277054
DOE Contract Number:
AC06-76RL01830
Resource Type:
Patent
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA
Country of Publication:
United States
Language:
English
Subject:
apparatus; in-situ; calibration; instruments; measure; fluid; depth; provides; method; apparatus; in-situ; calibration; distance; measuring; equipment; method; comprises; obtaining; distance; measurement; location; obtaining; distance; measurement; location; precisely; distance; location; calculating; calibration; constant; method; applied; specifically; calculating; calibration; constant; obtaining; fluid; level; embodied; apparatus; pressure; transducer; spacer; precisely; length; calibration; constant; calculate; depth; fluid; subsequent; single; pressure; measurements; submerged; position; pressure measurement; method comprises; pressure transducer; pressure measurements; method comprise; measuring equipment; situ calibration; situ calibration; in-situ calibration; in-situ calibration; fluid level; single pressure; measure fluid; distance measurement; distance measurement /73/