What is terahertz technology? What are the advantages and disadvantages of applying it to food nondestructive testing?

Terahertz generally refers to the electromagnetic wave with the frequency between 0. 1 and 10 terahertz, which is located between infrared and microwave, and is in the transitional stage from macroscopic electronics to microscopic photonics. The unique performance of terahertz technology has brought far-reaching influence to communication, radar, electronic countermeasures, electromagnetic weapons, astronomy, medical imaging, unmarked gene examination, cell imaging, nondestructive testing, safety inspection, biochemical inspection and other fields.

Advantage and disadvantages of application in food nondestructive teste

Terahertz has high transmittance, and it has good penetration to many dielectric materials and nonpolar substances, so it can be used to see through opaque objects.

Image is an effective supplement to X-ray imaging and ultrasonic imaging technology, and can be used for nondestructive testing in security inspection or quality inspection.

Low energy and low quantity will not cause photoionization and damage the water absorption of the measured substance.

Coherence, terahertz band contains rich physical and chemical information. The vibration and energy level transition of most polar molecules and biological macromolecules are in terahertz band, so according to these fingerprints, terahertz spectral imaging technology can distinguish the morphology of objects and analyze their physical and chemical properties.