The ultraviolet sensor only responds to ultraviolet rays in the narrow range of 185-260nm, and is not sensitive to light in other spectrum ranges. It can be used to detect ultraviolet rays in the flame. It is a closed and ultraviolet transparent glass tube filled with a special gas. Inside the glass tube, there are a pair of electrodes led by metal leads—anode and photocathode. The photocathode is made of a metal material that is only sensitive to ultraviolet rays and emits photoelectrons under ultraviolet rays.
Ultraviolet disinfection has a wide range of uses, such as hospitals, schools, nurseries, cinemas, buses, offices, homes, etc. It can purify the air, eliminate musty odors, and disinfect water. In addition, it can produce a certain amount of negative oxygen ions, which can be sterilized by ultraviolet rays. The air in the room is very fresh. In public places, ultraviolet disinfection can prevent some germs from spreading through the air or through the surface of objects.
It is the use of the appropriate wavelength of ultraviolet light to destroy the molecular structure of DNA (deoxyribonucleic acid) or RNA (ribonucleic acid) in microbial cells, causing growth cell death and (or) regenerative cell death, achieving the effect of sterilization and disinfection. After testing, the effective wavelength range of ultraviolet sterilization can be divided into four different bands: UVA (400～315nm), UVB (315～280nm), UVC (280～200nm) and vacuum ultraviolet (200～100nm). Among them, only the UVA and UVB parts can reach the earth's surface through the ozone protective layer and clouds. As far as the sterilization speed is concerned, UVC is within the absorption peak range of microorganisms, and can kill viruses and bacteria by destroying the DNA structure of microorganisms within 1s, while UVA and UVB are outside the absorption peak range of microorganisms, so the sterilization speed is very slow. It often takes several hours to achieve a sterilization effect. In the actual project's hydraulic retention (irradiation) time of a few seconds, this part is actually an invalid UV part. The penetration ability of vacuum ultraviolet light is very weak, and the lamp tube and sleeve need to use quartz with extremely high light transmittance. Generally, the TOC in the water is degraded in the semiconductor industry, and it is not used for sterilization. Therefore, the UV disinfection in water supply and drainage engineering actually refers to UVC disinfection. Ultraviolet light disinfection technology is based on modern epidemic prevention, medicine and photodynamics. It uses specially designed high-efficiency, high-intensity and long-life UVC band ultraviolet light to irradiate flowing water to remove various bacteria, viruses, parasites, and algae in the water. And other pathogens are killed directly to achieve the purpose of disinfection.
Water is one of the important conditions for maintaining life. The water in the human body accounts for about 65% of body weight. Under normal circumstances, each person needs to consume about 2-3 liters of water per day. Water is also a medium for the spread of many diseases. Such as cholera, typhoid fever, dysentery, leptospirosis and infectious hepatitis can be spread through water. Water is also susceptible to pollution from industrial waste water, domestic waste water, and human and animal feces, resulting in deterioration of water quality.
The ultraviolet disinfection device usually consists of a UVC ultraviolet lamp (UVC lamp for short), a quartz protective tube, a water inlet, a water outlet, a protective cap, and a stainless steel shell. Among them, most of them are installed horizontally, and the water inlet and outlet are on one side of the stainless steel shell. The defects and shortcomings of the horizontal installation of the UVC lamp: First, the horizontal installation limits the use range of the ultraviolet disinfection device. The second is that the position of the water inlet and outlet in the existing ultraviolet disinfection device causes the water flow to irradiate unevenly in the quartz tube, which causes the UVC lamp tube to sterilize the water incompletely. Third, the existing UV disinfection device with the same power is too large to be used in small water treatment equipment, nor can it meet the requirements for use in special occasions, such as water pollution in war, deserted islands, earthquake relief, and rescue. Mobile water treatment equipment to produce drinking water.
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