Portable device for use in the measurement of a component content of a material
US5229726A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 3, 1992 |
| Grant date | Jul 20, 1993 |
| Priority date | — |
| Expiry date | Jan 3, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N22/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A portable device for use in the measurement of the dielectric properties of materials such as fish includes: a microwave circuit comprising a microwave source (10) connected via an isolator (12) to a directional coupler (14), a first output (16) of which is connected to a reference detector (18) and a first pre-amplifier (28) and a second output (20) of which is connected via an attenuator (22) to a sensor (24), an output of which is connected to a signal detector (26) and a second pre-amplifier (30); and further including two amplifiers (32, 34) into which outputs of the first (28) and second (30) pre-amplifiers are connected and a logarithmic/ratio device (38) which provides an output proportional to the logarithm of the ratio of outputs from the two amplifiers (32, 34), wherein an output from the logarithmic/ratio device (38) is calibrated to provide the content of a particular constituent of the material under test.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.