Method for detecting shortage of products packaged by aluminum foil by microwave and detector thereof

Abstract

The invention discloses a microwave detection method for missed aluminum foil packages and a detector thereof. Missing of objects in an entire box or bag is judged, and whether the aluminum foil package is missed or not is judged through appropriate electrical signal output by utilizing the reflection and transmission characteristics of microwave signals in specific frequency to different objects, and by detecting the amplitude phase characteristic of echo signals. The signal of the oscillator of the detector enters the arm E of a magic T via an isolator, divided into two equiamplitude inversion signals, and respectively transmitted to two antennas through the two main arms of the magic T, two narrow beams are formed and respectively transmitted into two detected pieces in a detected box,and the reflected wave generated by the two detected pieces enters the two antennas. Because a phase shifter is arranged between one of the main arm of the magic T and the antennas, and hollow wave guide is arranged between the other main arm and the antennas, the two echo signals can return to the two main arms of the magic T in phase by adjusting the phase shift amount of the phase shifter, andcan be combined into one signal which is then output by the arm H of the magic T and enters a wave detector. The invention has the advantages of precise detection, convenient carrying, no radiation and no hazard of noise.

Description

a technical field [0001] The invention belongs to the detection technology of missing parts in packaging, in particular to a detection method and a detection instrument for detecting missing parts in aluminum foil packaging by using microwave technology. Two background technology [0002] The phenomenon of missing parts in packaging is a potential random event in the assembly line. Although the probability of its occurrence is small, it is an event that is unwilling to accept or occur for both consumers and manufacturers. Therefore, each assembly line is equipped with A safe, environmentally friendly, accurate, portable and cheap detection method is undoubtedly necessary. Although the currently widely used "X-ray transilluminator" (its function and principle are similar to airport security inspection equipment) can accurately determine the full box or package of missing parts through imaging, but due to its large size and expensive price, the more important It is its radiat...

AI Technical Summary

Problems solved by technology

Although the currently widely used "X-ray transilluminator" (its function and principle are similar to airport security inspection equipment) can accurately determine the full box or package of missing parts through imaging, but due to its large size and expensive price, the more important It is its radiation pollution that is likely to cause unavoidable harm to on-site operators

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