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Operational tests at focal distance 3 m
Experiments at distance
3 m were provided in most at a laboratory room, which had wide
windows at right side from the system. This permission was without
air-condition unit, so at summer time air temperature inside may be
higher than 25 C degrees that reducing temperature contrasts. An option of video registration
sometimes wasn't provided because process of software
debugging, so several photos were made by photo camera. It need
to be mentioned that images were collected at different days and some defects in images were fixed at the time of
experiments as the result hardware adjustments.
Some comments to the
images are presented below.
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Test area with tree different temperature sources fixed at a metal rail: 1) radiated surface (distributed mm-wave load, absorbing material, 50x50 cm2)) thermally stabilized at 53 C degree (right); 2) Noise generator at the band 84-100 GHz with horn antenna (2x2 cm) (in the center) and waveguide attenuator ; 3) Ceramic material at shape of disc with electric heater (left) Several frames were integrated with the aim to improve radiometric sensitivity in the image |
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No photo |
MMW image of a man at room conditions. With the aim to improve radiometric sensitivity 4 serial frames were integrated. A bug in software in the form of radial line at the edges of frames was presented at the moment of measurements as well also defect in the form of small red ring was occurred because of one bad operating channel of the receiver.
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No photo
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A men at room conditions (single frame) with hand in front of distributed hot radiator. Defect in the form of red ring was occurred because of one bad operating channel of the receiver.
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No photo
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A men at room conditions (single frame) with a shield in the form of absorbing sheet 50x50 cm with a hole 20 cm in diameter placing in front of distributed hot radiator. Initially man is behind support metal rail, then in front of rail with small shadow object on the body, then with shadow absorbing sheet. Defect in the form of red ring was occurred because of one bad operating channel of the receiver.
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A men at room conditions with a shields in the form of metal object at the chest level, which simulated a foreign object on the body. With the aim to improve radiometric sensitivity 4 serial frames were integrated. An electric lamp as a heat radiator + separate noise generator with horn antenna are presented at the backplane (left side). A bug in software in the form of radial line at the edges of frames was presented at the moment of measurements.
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A men at outdoors conditions (summer time) under "clod" clear sky radiation with some small foreign objects at the pockets. It may be seen reflection of "cold" sky radiation (blue color) from appropriate parts of the body (emissivity of skin is ~ 0,6). Dynamic range of the signals is too high and should be compressed for better interpretation (software option doesn't realized yet). Foreign object at the pockets (mobile phone, port money) are at positions that provide small reflection of sky radiation. Because of that poor visualization of them was fixed at the images.
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