[특허]Meter and method for in situ measurement of the electromagnetic properties of various process materials using cutoff fre

Meter and method for in situ measurement of the electromagnetic properties of various process materials using cutoff fre 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01N-022/04 G01R-027/04
출원번호	US-0045854 (1993-04-09)
발명자 / 주소	Jean Buford R. (Round Rock TX) Warren Gary L. (Austin TX) Whitehead F. Lynn (Austin TX)
출원인 / 주소	Thermedics Inc. (Woburn MA 02)
인용정보	피인용 횟수 : 34 인용 특허 : 0

초록 ▼

The present invention provides an apparatus and method for the measurement of, for example, the moisture in a material or, more generally, for the measurement of any material parameter which may be inferred by measuring the electromagnetic properties of the material under investigation. The electromagnetic properties of use in the present invention are complex electrical permittivity or the magnetic permeability of the material. The meter apparatus of the present invention comprises a controllable source of electromagnetic energy having stable selectable frequency. The controllable source of electromagnetic energy is coupled to a material measurement chamber by means of probes, loops, antennas, apertures or other structures so as to establish an electromagnetic wave inside the measurement chamber thereby causing the wave to interact with the material contained in the chamber. Its preferred structure comprises coupling of microwave energy from a coaxial transmission line to the measurement chamber over a multi-octave bandwidth via an intermediate microstrip to slotline coupling circuit.

대표청구항 ▼

A method for the measurement of a parameter of a material which may be determined by measuring the electromagnetic properties of the material under investigation comprising the steps of: (a) causing a material to pass through a frequency sensitive measurement cell having a known cutoff frequency response characteristic; (b) exposing the material to electromagnetic energy produced by a frequency source, said electromagnetic energy comprising at least two linear polarizations; (c) measuring the phase or amplitude difference between the two polarizations subsequent to said energy having passed through the measurement cell and thereafter producing at least two distinctive cutoff frequency response characteristics; (d) converting the output signals to digital representations; (e) analyzing the digital representations of the signals to determine the measured cutoff frequency response characteristics of the measurement cell having material therein; (f) determining the sharpness of the measured cutoff frequency response characteristics; and (g) determining, from the known cutoff frequency response characteristics and sharpness of the cutoff frequency response characteristics, a parameter of the material.

이 특허를 인용한 특허 (34)

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

내보내기 구분	파일저장 인쇄 메일전송
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연합인증

Meter and method for in situ measurement of the electromagnetic properties of various process materials using cutoff fre 원문보기

초록 ▼

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Meter and method for in situ measurement of the electromagnetic properties of various process materials using cutoff fre 원문보기

초록 ▼

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연구과제 타임라인

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이 특허를 인용한 특허 (34)

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