How the metal detectors work?
The operation of metal detectors is based on the principles of electromagnetic induction. It generates a rapidly changing magnetic field by running the alternating current though coil, which will generate eddy currents inside the metal objects. Thereby, the eddy currents will create a new magnetic field that affects the original one, and then the metal detectors will utter a high-pitched tone. The accuracy and reliability of the metal detectors depend on the stability of frequency of electromagnetic launchers. Generally, the frequency is between 80 to 800 KHz. The lower the frequency, the better detection for iron objects. Similarly, the higher the frequency, the better detection for high carbon steel objects. The sensitivity of the metal detectors decreases with the expanding detecting range. Moreover, the induction signal depends on the metal particle size and conductivity.
What is the application of metal detectors?
According to the application purpose of metal detectors, it can be classified into three types: all-metal detectors, iron metal detectors, aluminum foil metal detectors. The all-metal detectors are able to detect all kinds of metal impurity of different metal materials. They enjoy wide popularity around the world, which gain the highest market share. The all-metal detectors can be used widely in food detecting. They are specially used in detecting the metal impurity in meat, beverage, fruits, vegetables, dairy products, food additives, and health care products and so on. Besides, they can be used to detect the metal impurity in chemical raw materials, rubber, plastics, textile, leather, chemical fiber and toys, etc. Moreover, all-metal detectors can also applied in the areas of medicine, biological, cosmetics, packaging and paper. Next are the iron metal detectors, which is specially used for iron detecting. They are mainly applied in clothing, textile field and other sewing products industry. They are used for detecting the broken needle left over the products during the production. The last one is the aluminum foil metal detectors. As their names indicate, they are used to detect the aluminum foil. The medicine packaging bags and the food packages are mainly made in aluminum foil, which determines the aluminum foil metal detectors are mainly applied in the medicine and food packaging field.
source:detectorall
It generates a rapidly changing magnetic field by running the alternating current though coil, which will generate eddy currents inside the metal objects. Thereby, the eddy currents will create a new magnetic field that affects the original one, and then the metal detectors will utter a high-pitched tone. The accuracy and reliability of the metal detectors depend on the stability of frequency of electromagnetic launchers.
that part is confusing for non-physic people. But if you're answering question for a class, nothing is wrong.
They enjoy wide popularity around the world, which gain the highest market shareand gain the highest market shares.
Besides, they can be used to
they can also be used
which is specially used for iron detecting
which are, or can change "iron metal detectors" to "iron metal detector"
The last one is the aluminum foil metal detectors.
"last one is " - i'd say you change ur 2nd question from "they" to "it" all
all-metal detectors, iron metal detectors
and aluminum foil metal detectors.
They enjoy wide popularity around the world
, which gainwhile gaining the highest market share
Moreover, all-metal detectors can also be applied in the areas of medicine, biological, cosmetics, packaging and paper.
I don't have the subject knowledge, but these are well written responses :D
