{"id":6217,"date":"2025-12-31T09:00:00","date_gmt":"2025-12-31T15:00:00","guid":{"rendered":"https:\/\/www.oxidationtech.com\/blog\/?p=6217"},"modified":"2025-12-09T10:02:37","modified_gmt":"2025-12-09T16:02:37","slug":"understanding-uv-absorption-technology-for-gas-measurement","status":"publish","type":"post","link":"https:\/\/www.oxidationtech.com\/blog\/understanding-uv-absorption-technology-for-gas-measurement\/","title":{"rendered":"Understanding UV Absorption Technology for Gas Measurement"},"content":{"rendered":"\n

Reliability<\/h2>\n\n\n\n

UV absorption<\/a> technology is one of the most reliable methods for measuring gas concentrations in a wide range of applications. This approach works on a straightforward principle: gases absorb ultraviolet light at specific wavelengths. By sending UV light through a sample and measuring how much is absorbed, an analyzer can determine the exact concentration of the gas present.<\/p>\n\n\n\n

Precision<\/h2>\n\n\n\n

What makes UV absorption<\/a> especially useful is its precision. It\u2019s not influenced by humidity, temperature shifts, or the presence of most other gases, which helps ensure stable and accurate readings. This durability also means the system requires less frequent maintenance than many other measurement methods.<\/p>\n\n\n\n

Flexibility<\/h2>\n\n\n\n

Another advantage is its flexibility. UV analyzers<\/a> can be configured for low-level or high-concentration environments, making them valuable for industries that need dependable, continuous monitoring. Because the technology is based on optical measurement rather than chemical reactions, it offers long-term reliability without consumables or frequent calibration.<\/p>\n\n\n\n

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\"UV<\/a>
UV Analyzer <\/a> Setup for Ozone<\/figcaption><\/figure>\n\n\n\n

Oxidation Technologies<\/a><\/p>\n\n\n\n

Did you know?<\/h3>\n\n\n\n
\"UV<\/a>
Ultraviolet or UV light<\/a> is light that has a higher frequency than visible light. As violet is the color of the highest frequency of visible light; ultraviolet light<\/a> is the term we apply to light that has frequencies higher than visible light.<\/figcaption><\/figure>\n<\/div>\n\n\n\n
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A UV ozone analyzer<\/a> typically includes:<\/strong><\/p>\n\n\n\n

 UV Light Source<\/strong><\/p>\n\n\n\n

– Usually, a low-pressure mercury lamp producing stable UV light at 254 nm. <\/p>\n\n\n\n

 Sample Cell (Optical Pathway)<\/strong><\/p>\n\n\n\n

– Sample gas is drawn through this chamber<\/a>, and the UV light passes through it.<\/p>\n\n\n\n

 Detector<\/strong><\/p>\n\n\n\n

– Measures the intensity of UV light after it passes through the sample.<\/p>\n\n\n\n

 Reference Measurement<\/strong><\/p>\n\n\n\n

– A second optical path or filtered air stream provides a \u201czero ozone\u201d reference.<\/p>\n\n\n\n

 Signal Processing<\/strong><\/p>\n\n\n\n

– The analyzer computes ozone concentration based on the reduction in UV intensity caused by ozone absorption.<\/p>\n\n\n\n

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Compare O3 Sensor Technologies<\/a><\/h4>\n\n\n\n

  -UV Absorption Ozone Analyzer<\/a><\/p>\n\n\n\n

     -Electrochemical Ozone Sensor<\/a><\/p>\n\n\n\n

     –Heated Metal Oxide Ozone (HMOS) Sensor<\/a><\/p>\n<\/div>\n<\/div>\n\n\n\n

How It Works<\/h2>\n\n\n\n
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  1. A sample of the gas is drawn into a chamber<\/a>, where a UV light source shines through it at a specific wavelength.<\/li>\n\n\n\n
  2. If the target gas is present, it absorbs part of that UV light. The more gas present, the more light is absorbed.<\/li>\n\n\n\n
  3. By comparing the light intensity before and after it passes through the chamber<\/a>, the analyzer calculates the gas concentration using a predictable absorption relationship.<\/li>\n\n\n\n
  4. For additional accuracy, the system may take a baseline measurement using a \u201czero-gas\u201d sample where the target gas has been removed.<\/li>\n<\/ol>\n\n\n\n
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    UV Analyzer<\/a> Products<\/a><\/h2>\n\n\n\n