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What is an ozone concentration detector?
The principle behind the ozone concentration detector is the ultraviolet absorption method. It uses a stable ultraviolet light source to generate ultraviolet radiation, and a filter selectively allows only ultraviolet light with a wavelength of 253.7 nm to pass through while blocking other wavelengths. After being sampled by a photoelectric sensor, the ultraviolet light passes through an ozone absorption cell before being re-sampled by the photoelectric sensor. By comparing the electrical signals from the two photoelectric sensors—one taken after passing through the ozone absorption cell and the other as a reference— and then applying a mathematical model, the ozone concentration can be determined.
Ozone Concentration Detector The principle behind this method is ultraviolet absorption. It employs a stable ultraviolet light source to generate UV radiation, and uses optical filters to block other wavelengths of UV light, allowing only UV radiation with a wavelength of 253.7 nm to pass through. After being sampled by a photoelectric sensor, the UV radiation then passes through an ozone absorption cell before being sampled again by the photoelectric sensor. By comparing the electrical signals from the two photoelectric sensors—one taken after passing through the ozone absorption cell and the other directly from the initial sample—the mathematical model is calculated, thereby determining the ozone concentration.
We need to understand that there is an ozone layer in Earth’s atmosphere. Scientific research has shown that the ozone layer absorbs ultraviolet (UV) light. Studies indicate that ozone has an absorption coefficient for UV light at a wavelength of 253.7 nm. At this specific wavelength, UV light undergoes attenuation as it passes through the ozone layer, in accordance with the Beer-Lambert law. This method has been developed by countries such as the United States and adopted as a standard teaching approach for ozone analysis. Ozone Concentration Detector The principle behind this method is ultraviolet absorption. It employs a stable ultraviolet light source to generate UV radiation, and uses optical filters to block other wavelengths of UV light, allowing only UV radiation with a wavelength of 253.7 nm to pass through. After being sampled by a photoelectric sensor, the UV radiation then passes through an ozone absorption cell before being sampled again by the photoelectric sensor. By comparing the electrical signals from the two photoelectric sensors—one taken after passing through the ozone absorption cell and the other directly from the initial sample—the mathematical model is calculated, thereby determining the ozone concentration.
Basic Structure of an Ozone Concentration Detector
The ozone concentration detector consists primarily of a low-pressure ultraviolet lamp, a light-wave filter, an incident ultraviolet reflector, an ozone-absorbing cell, sampling and photoelectric information sensors, a sampling photoelectric detection sensor, an output control display, and circuitry.
Application Scope of Ozone Concentration Detectors
Ozone Concentration Detector The system can primarily be used in production workshops for ozone generation (such as ozone generators and ozone workshops), as well as in the chemical, petroleum, paper-making, textile, pharmaceutical, fragrance and flavor industries, and in sectors like water treatment and food processing—particularly in medical sterilization workshops.
Principle of Ozone Concentration Detectors
The detection principles of ozone concentration detectors include semiconductor-based (uke2v), electrochemical, and ultraviolet methods. Here, we will primarily focus on the third and second methods—namely, the ultraviolet method.
Concentration Calculation
The mathematical model for ozone concentration is derived based on Lambert’s Law and Beer’s Law (as shown in Formula 1). In this ozone concentration calculation formula, as long as the sample current, the reference current, and the distance between the sample and the ozone absorption cell are known, the ozone concentration can be determined. Due to the limitation imposed by the distance over which ozone can be absorbed, measurements of ozone concentrations with different values can only be obtained up to 300 µg/m³.
Circuit Principles
The basic circuit of the ozone concentration detector consists of six parts: power supply, UV lamp control, UV sampling and detection, logarithmic amplifier Log100, analog output, and display.
The power supply component primarily consists of a high-voltage system power supply required for manufacturing UV lamps, as well as a +15VDC power supply needed for production and on the circuit board. The ultraviolet lamp control section mainly ensures that the current flowing through the UV lamp remains within a constant, permissible range; if the current exceeds or falls below this range, the system will automatically adjust itself. If the UV lamp has reached the end of its service life, a red indicator light on the panel will illuminate to remind you to replace the UV lamp with a new one. Standard ultraviolet detection methods and sampled ultraviolet detection methods are also crucial components. A photoelectric sensor converts the ultraviolet light signal into a voltage signal, which is then amplified by two operational amplifiers arranged in series before being sent to the LOG100 for computational processing and output display. The analog signal output—ranging from 0 to 20 mA—is linearly correlated with the ozone treatment concentration.
Key words: Custom-made ozone generators, ozone for formaldehyde removal, household sterilization and disinfection machines, ozone generator manufacturers
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