Browse Prior Art Database

SINGLE PROBE LOCATION COAXIAL WAVEGUIDE FOR DIELECTRIC CONSTANT AND CONDUCTIVITY MEASUREMENTS

IP.com Disclosure Number: IPCOM000009431D
Original Publication Date: 1999-Sep-01
Included in the Prior Art Database: 2002-Aug-23
Document File: 2 page(s) / 85K

Publishing Venue

Motorola

Related People

Danny McCoy: AUTHOR [+2]

Abstract

The purpose of this disclosure is to introduce a device for measuring dielectric constants and con- ductivities of solutions of simulated human tissue or mixtures. Advantages of this device include vari- able test positions for high frequencies and only one probe location.

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Developnwnts Technical 0 M MOTOROLA

   SINGLE PROBE LOCATION COAXIAL WAVEGUIDE FOR DIELECTRIC CONSTANT AND CONDUCTIVITY MEASUREMENTS

by Danny McCoy and Michael Kanda

  The purpose of this disclosure is to introduce a device for measuring dielectric constants and con- ductivities of solutions of simulated human tissue or mixtures. Advantages of this device include vari- able test positions for high frequencies and only one probe location.

  The slotted line technique, the multiple fixed connector line technique, and the open ended wave- guide technique for measuring solution parameters have been discussed in a previous disclosure. This new method differs from all of the others because rather than probing the fluid at different locations within the medium, a single probe is used and the relative fluid level is varied. This gives the advan- tage of measuring propagation losses and phase changes within the medium without potential inter- ference of other probes or slot. Thus constant slopes of phase and amplitude can be checked. Another advantage is that simple location positioners can be interfaced to the new coaxial line. This allows vari- able programmable location increments with the ability of reading multiple test frequency data from each location. Thus with an accurate robot, this incremental resolution for higher frequencies is pos- sible. Figure 1 shows the setup.

  The measurement is done as follows: The coaxi- al guide is connected to the positioner and network analyzer for transmission measurement. The posi- tioner positions the coax into the mixture so that the fluid level is slightly above the probe. Next, the posit...