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:
-
- Golden, CO
- Belmont, MA
- Issue Date:
- Research Org.:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- OSTI Identifier:
- 867265
- Patent Number(s):
- 4899100
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Classifications (CPCs):
-
G - PHYSICS G01 - MEASURING G01G - WEIGHING
- 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 = {Mon Jan 01 00:00:00 EST 1990},
month = {Mon Jan 01 00:00:00 EST 1990}
}