Reflection-mode imaging in sub-Terahertz range at 100GHz

Demonstration of reflection-mode operation of Terasense Imaging camera TERA-4096. The sensor is 64×64 pixel array with 3 mm pitch.

TERASENSE imaging systems are ideal for various objects detection / identification purposes -within intended range of 0.05 to 0.7 THz. Rapid non-destructive characterization of object and defects in uniform materials is one of the primary applications of Terasense terahertz imaging technology known to date.

This test vividly demonstrates the capabilities of our TERA-series imaging cameras to detect various objects of various shapes and sizes in reflection mode. We can see how image of an object appears and changes on the screen when the objects are placed in front of the imaging camera. Objects used in the test were various shapes of metallic foil and a plastic bottle of water. We know for a fact that the overwhelming majority of plastics, cardboard & paperboards, rubbers, polymer fibers are absolutely transparent in T-rays. This explains why the image remained unaffected, when some of these materials translucent for Terahertz waves were placed between the target and our imaging camera.

The test employs TERA-4096 sub-THz imaging camera, as detailed below, and Terahertz source /IMPATT diode/ radiating at 100 GHz; respective Terahertz optics and a lap-top with USB port.

TERA-4096 sub-Terahertz Imaging Sensor Array
Spectral Range 40 GHz — 0.7 THz
Frequency set for the test 100 GHz
Pixel Size / Pitch: 3 x 3 mm
Number of Pixels 4096
Responsivity 50kV/W
Noise Equivalent Power: 1 nW/Hz0.5
Size of device: 20 x 20 x 10 cm
Terasense Viewer Software

The distance from our imaging sensor array to the target set for this reflection mode imaging test is aprx. 1 m. All in all, far our experience in remote imaging has been mainly focused on the distances of 1 to 3 meters away from the target, which appears optimal for our Terahertz imaging tasks.
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