Micro-residue detection and harmonic detection are two cutting-edge technologies of mobile phones.
Harmonic detection
Radiation principle of harmonic detection
Harmonic detection is to use nonlinear targets to generate new frequency components under microwave radiation. Harmonic detection is to transmit fundamental wave signals, receive second, third or even higher harmonic/combined wave echo signals radiated by the target, and judge, identify and detect the target.
Harmonic detection is harmful to human body.
Although harmonic detection can detect objects with metal nodes, it is very harmful, especially to human health.
Harmonic detection will not only pollute the power grid and affect the stability of lines, but also pollute electronic equipment to some extent, resulting in abnormal operation of electronic equipment. But in fact, harmonic detection is also very harmful to human health, which seriously damages human health.
Physiologically speaking, when human cells are stimulated and excited, they will undergo rapid electric fluctuation or reversible inversion based on the resting potential of the cell membrane. If the frequency is close to the harmonic frequency, the electromagnetic radiation of power grid harmonic will directly affect people's brain magnetic field and heart magnetic field, which will seriously affect people's health.
According to the analysis of relevant experts, the generation of harmonic current is easy to form a low-frequency magnetic field, and the harm to human body is mainly the environmental impact of this low-frequency magnetic field. Living in an environment full of low-frequency magnetic fields for a long time, people will have some uncomfortable phenomena, such as common sub-health conditions, including frequent symptoms such as drowsiness, fatigue, insomnia, muscle aches and emotional instability. In addition, according to the research and evaluation of the World Health Organization, low-frequency magnetic fields are related to childhood leukemia and brain cancer. When the magnetic field exposure intensity exceeds 0.3 μ t, the risk of childhood leukemia increases twice ... Norwegian scholars' research shows that low-frequency magnetic fields are easy to cause female breast cancer. Some experts have suggested that long-term exposure to low-frequency magnetic fields will increase the incidence of male infertility. Because electromagnetic induction will lead to abnormal biomembrane potential, which will lead to abnormal cell function and abnormal cell state. If it leads to the dysfunction of germ cell biofilm, it will destroy or inhibit cell activity, such as sperm production and activity decline, leading to infertility.
To sum up, the harm of harmonics to human body should not be underestimated, especially in those environments with serious harmonic pollution for a long time, the possibility of human illness is greater. Therefore, we must pay attention to the problem of harmonic control and take measures as soon as possible to provide a harmonic-free and pollution-free environment for people's work and life.
Disadvantages of harmonic detection
1. Only items with nodes can be detected.
Harmonic detection is to detect nonlinear targets by using the basic physical mechanism of harmonic re-radiation of nonlinear targets such as metal nodes. That is to say, harmonic detection can only detect objects with metal nodes, but linear harmonic detection of objects without nodes can't.
2. The false alarm rate is high.
It is precisely because harmonic detection can only detect items with nodes, so some nonlinear items, such as right-angled glasses, will be misreported, and some items with the same or different metals connected by nodes, such as watch chains, will also be misreported.
Harmonic detection must be used to detect the following characteristic items.
1, IC cards and other articles with chips.
2. Electronic modules and components
Slight residual exploration
Micro-residue detection means that an object will produce some special object residues with its own properties in a specific space, and these residues will change regularly (increase or decrease the residual value) with the change of environment. This residue can be detected by special detection equipment, so the micro-residue detection technology is formed.
All objects in the world are made up of molecules and atoms. Whether they are stationary or moving, their residual values will change with the changes of various conditions. For example, in the process of walking, the residue produced by human body is different from that produced by people moving on the bus, and the residue of human body on the moving car body is higher than that in walking.
There is no radiation to the body and the false alarm rate is low.
Trace residue detection technology is an advanced detection method in the detection technology market at present. It uses micro-residue detection technology, which belongs to the way of detection, and will not change the original properties of the object and will not produce any radiation to the human body. This detection technology has high detection accuracy, high accuracy and low false alarm rate.