We know that there is an ozone layer in the Earth's atmosphere. Scientists have discovered that the ozone layer absorbs ultraviolet (UV) radiation. Studies have shown that ozone has a maximum absorption coefficient only for UV radiation with a wavelength of 253.7nm. At this wavelength, UV radiation is attenuated by ozone, conforming to Lambert-Beer's Law. This method has been adopted as the standard ozone analysis method by countries such as the United States. This ozone detector uses the principle of UV absorption. It uses a stable UV lamp source to generate UV radiation, and uses a light filter to filter out other wavelengths of UV light, allowing only the wavelength of 253.7 nm to pass through.
After passing through the sample photoelectric sensor and then the ozone absorption cell, the light reaches the sampling photoelectric sensor. By comparing the electrical signals from the sample photoelectric sensor and the sampling photoelectric sensor, and then calculating using a mathematical model, the ozone concentration can be determined.
