Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1989-03-17
1991-07-30
Callahan, Timothy P.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
328151, 328155, 307311, 329313, 329360, 329361, H03K 522
Patent
active
050362895
ABSTRACT:
An infrared detector output of a radiometer is amplified and inverted to provide a first signal which is amplified to a predetermined level and a second signal which is inverted with respect to the first signal and amplified to a fraction of the predetermined level of the first signal. The first and second signals are alternately sampled to sample portions of those signals which occur when the detector of the radiometer is viewing the target and then viewing the reference. The signals are sampled once while the detector of the radiometer is looking at the target and twice occurring on each side of the target sample when the detector is looking at the reference signal. The first and second signals are separately integrated in accordance with a predetermined timing pattern determined by the sampling rate of the first (target) and second (reference) signals. The peak integrated outputs of the first and second signals are held then sampled to produce the demodulated output from the radiometer. The integrating circuit is then dumped during the time of the second target view of the detector, to restart the integrating cycles which permits integrating every other signal which appears on the detector through the radiation chopper of the radiometer. With the addition of a second integrator circuit which is alternately phased with the first in respect to clear and target timing, every signal which appears on the detector is integrated and sampled with no retention. Complete views of the target are provided for every opening and there is no recall of any previous signal providing full band width for the chopper of the radiometer. This type of synchronous demodulation provides an improvement in noise characteristics over previous full wave rectified radiometer output methods.
REFERENCES:
patent: 3445663 (1969-05-01), Jones et al.
patent: 3845400 (1974-10-01), Yee
patent: 4692890 (1987-09-01), Arseneau
patent: 4698523 (1987-10-01), Gershon et al.
patent: 4716373 (1987-12-01), Schulze
Callahan Timothy P.
Infrared Systems, Inc.
LandOfFree
Method and apparatus for synchronously demodulating detector out does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for synchronously demodulating detector out, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for synchronously demodulating detector out will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1544777