Patent US3591713A successfully refreshed from Google Patents.
US3591713A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermography equipment for producing a directly observable thermal picture
Assignee: Saab Bofors AB
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Filing: 1968-12-18
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Granted: 1971-07-06
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Expires: 1988-12-18
Abstract
Abstract A signal transmission system for passing signals from the detector to the intensity modulating electrode of a picture tube in a thermography equipment of the type in which a ''''heat picture'''' of the depicted object is produced on the screen of a cathode-ray tube. The system includes a normal video channel and an additional channel for producing a so-called thermal band. Switching means are provided for simultaneously connecting a limiting device into the normal video channel and connecting the additional channel in parallel with the normal channel. The limiting device limits the output signals from the normal channel to a level below the constant maximum level of the output pulses from the additional channel. A gate is included in the normal channel and is controlled by the output pulses from the additional channel so as to block the normal channel, when output pulses appear in the additional channel.
Inventors
- 👤 Tore Bertil Reinhold Olsson
- 👤 Ake Valentin Nilsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:19
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/30; H04N5/33
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
264 words
Arrangement in thermography equipment of the kind comprising a camera with scanning means for pointwise scanning the field of view of the camera and directing the received infrared radiation towards a detector which produces a signal the strength of which varies with the intensity of the received radiation, a picture tube of the cathode-ray type combined with sweep means for causing the electron beam in the picture tube to sweep across the picture screen of the tube in synchronism with the scanning means of the camera, a first transmission channel including an amplifying stage for passing the signals from the detector to intensity modulating means in the picture tube, said first transmission channel comprising a video amplifier for producing an output signal varying in substantially the same way as the input signal, and a second transmission channel which is optionally connectable in parallel with the first transmission channel and comprises means for transmitting and amplifying only such signals whose level lies within predetermined limits, characterized in that further comprises a limiting device which is connectable to the first transmission channel at the same time as the second transmission channel is connected, said limiting device including means for limiting the output signal from the first transmission channel to a maximum level which lies below the level of the output signal from the second transmission channel, and that the first transmission channel is provided with switching means, controlled by output signals from the second transmission channel, for preventing transmission of signals from the first transmission channel when an output signal appears in the second transmission channel.
Claim 2
Dependent Claim
264 words
Arrangement in thermography equipment of the kind comprising a camera with scanning means for pointwise scanning the field of view of the camera and directing the received infrared radiation towards a detector which produces a signal the strength of which varies with the intensity of the received radiation, a picture tube of the cathode-ray type combined with sweep means for causing the electron beam in the picture tube to sweep across the picture screen of the tube in synchronism with the scanning means of the camera, a first transmission channel including an amplifying stage for passing the signals from the detector to intensity modulating means in the picture tube, said first transmission channel comprising a video amplifier for producing an output signal varying in substantially the same way as the input signal, and a second transmission channel which is optionally connectable in parallel with the first transmission channel and comprises means for transmitting and amplifying only such signals whose level lies within predetermined limits, characterized in that further comprises a limiting device which is connectable to the first transmission channel at the same time as the second transmission channel is connected, said limiting device including means for limiting the output signal from the first transmission channel to a maximum level which lies below the level of the output signal from the second transmission channel, and that the first transmission channel is provided with switching means, controlled by output signals from the second transmission channel, for preventing transmission of signals from the first transmission channel when an output signal appears in the second transmission channel.
Claim 3
Dependent Claim
32 words
An arrangement as claimed in claim 1, characterized in that the limiting device comprIses a zener diode which is connectable across the output of the amplifying stage in the first transmission channel.
Claim 4
Dependent Claim
33 words
An arrangement as claimed in claim 1, characterized in that said switching means comprises a normally open electronic gate which is adapted to be closed by output signals from the second transmission channel.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |