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Title: Microwave measurement of the mass of frozen hydrogen pellets

Abstract

A nondestructive apparatus and method for measuring the mass of a moving object, based on the perturbation of the dielectric character of a resonant microwave cavity caused by the object passing through the cavity. An oscillator circuit is formed with a resonant cavity in a positive feedback loop of a microwave power amplifier. The moving object perturbs the resonant characteristics of the cavity causing a shift in the operating frequency of the oscillator proportional to the ratio of the pellet volume to the volume of the cavity. Signals from the cavity oscillation are mixed with a local oscillator. Then the IF frequency from the mixer is measured thereby providing a direct measurement of pellet mass based upon known physical properties and relationships. This apparatus and method is particularly adapted for the measurement of frozen hydrogen pellets.

Inventors:
 [1];  [2]
  1. (Golden, CO)
  2. (Belmont, MA)
Issue Date:
Research Org.:
MASSACHUSETTS INST OF TECH
OSTI Identifier:
867265
Patent Number(s):
4899100
Assignee:
United States of America as represented by United States (Washington, DC) OSTI
DOE Contract Number:  
AC02-78ET51013
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
microwave; measurement; mass; frozen; hydrogen; pellets; nondestructive; apparatus; method; measuring; moving; based; perturbation; dielectric; character; resonant; cavity; caused; passing; oscillator; circuit; formed; positive; feedback; loop; power; amplifier; perturbs; characteristics; causing; shift; operating; frequency; proportional; ratio; pellet; volume; signals; oscillation; mixed; local; mixer; measured; providing; direct; physical; properties; relationships; particularly; adapted; oscillator circuit; direct measurement; operating frequency; power amplifier; feedback loop; particularly adapted; physical properties; microwave power; microwave cavity; resonant cavity; local oscillator; direct measure; positive feedback; resonant microwave; microwave measurement; wave cavity; /324/

Citation Formats

Talanker, Vera, and Greenwald, Martin. Microwave measurement of the mass of frozen hydrogen pellets. United States: N. p., 1990. Web.
Talanker, Vera, & Greenwald, Martin. Microwave measurement of the mass of frozen hydrogen pellets. United States.
Talanker, Vera, and Greenwald, Martin. Mon . "Microwave measurement of the mass of frozen hydrogen pellets". United States. https://www.osti.gov/servlets/purl/867265.
@article{osti_867265,
title = {Microwave measurement of the mass of frozen hydrogen pellets},
author = {Talanker, Vera and Greenwald, Martin},
abstractNote = {A nondestructive apparatus and method for measuring the mass of a moving object, based on the perturbation of the dielectric character of a resonant microwave cavity caused by the object passing through the cavity. An oscillator circuit is formed with a resonant cavity in a positive feedback loop of a microwave power amplifier. The moving object perturbs the resonant characteristics of the cavity causing a shift in the operating frequency of the oscillator proportional to the ratio of the pellet volume to the volume of the cavity. Signals from the cavity oscillation are mixed with a local oscillator. Then the IF frequency from the mixer is measured thereby providing a direct measurement of pellet mass based upon known physical properties and relationships. This apparatus and method is particularly adapted for the measurement of frozen hydrogen pellets.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1990},
month = {1}
}

Patent:

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