Device and method for determining the presence of resonant mater

Details Device and method for determining the presence of resonant mater Device and method for determining the presence of resonant mater

1976-03-17

1978-05-02

Caldwell, Sr., John W.

Communications: electrical

Systems

Call station

324 585C, G08B 1710, G01R 2704, H01P 706

Patent

active

040877981

ABSTRACT:
A spectroscopic refractometer has a plurality of resonant cavities through which the environment to be sampled may pass, including a first resonant cavity constructed and tuned to resonate at a transition frequency of the resonant material of interest and a second resonant cavity constructed and tuned to resonate at a nontransition frequency closely associated to the transition frequency to which the first resonant cavity is tuned. The resonant cavities are excited by electromagnetic oscillations corresponding in frequency to the transition and the nontransition frequency. A corrrelating parameter, such as frequency difference, is determined between the signals within the first and second resonant cavities, which in the absence of the resonant material of interest has a constant value. In the presence of the resonant material of interest a change in the value of the correlating parameter is detected and subsequently compared with the constant value of the correlating parameter so as to determine the presence of the resonant material of interest.

REFERENCES:
patent: 2580968 (1952-01-01), Sproull
patent: 2792548 (1957-05-01), Hershberger
patent: 2849613 (1958-08-01), Dicke
patent: 2933696 (1960-04-01), Reder et al.
patent: 3458808 (1969-07-01), Agdur
patent: 3998557 (1976-12-01), Javan

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