Application of ozone sensor and relevant knowledge
Why monitor ozone?
Ozone plays an important role in protecting life on Earth's surface by shielding the sun's harmful rays from reaching the surface. Because of the catastrophic exposure of ground-level ozone to life on Earth, various conservation agencies must accurately measure ozone gas. A key component of air quality management involves ozone monitoring in the atmosphere and ambient air. Different electrochemical and gas sensor technologies have been developed to monitor ozone concentration. In the past, UV absorption has been the basis of traditional monitoring equipment. Ozone sensors can be expensive, energy inefficient, and are often located in fixed locations, limiting the portability of such sensors. JXCT is an equipment manufacturer with many years of experience. Fixed and portable monitoring equipment can better meet your needs.
How do you detect ozone?
Because of the importance of understanding air quality and ozone concentrations in the stratosphere, several types of investments are being made to improve ozone sensors. In a recent study, electrochemical sensors were used in a miniature ozone sensor combined with a laboratory jack. This ozone sensor was compared with conventional systems for measuring or monitoring ozone concentration. The electrochemical sensor is capable of generating a voltage signal proportional to the ozone concentration in the range of 5ppb-10ppm. The effects of gas sample flow rate and relative humidity (RH) were also considered and studied separately.
A rapid change in RH of about 20%/min produces a noticeable and immediate change in the signal from the ozone sensor. In contrast, a slow change in relative humidity of 0.1%/min has little or negligible effect on the response of the ozone sensor. The miniature ozone sensor has been tested in practical applications.
In another example, air quality was monitored for 18 days. The sensor measurements were found to be close to those recorded in previous studies using conventional sensors. During the 18-day air quality monitoring, the data collected by the sensor was consistent with the data collected by the reference UV-ozone analyzer. Miniature electrochemical sensors for measuring ozone in ambient air quality monitoring and laboratory conditions to allow the device to be used as a replacement for conventional devices. This miniaturized electrochemical ozone sensor is cheaper, has lower power consumption, is portable, and is more convenient to use.
Limitations of Ozone Sensors
Today, commercially available ozone sensors are based on semiconductor ozone sensors or electrochemical principles. In principle, these sensors are sensitive enough to sense parts per billion (ppb) of ozone for outdoor air pollution and quality monitoring.
These ozone sensors are inexpensive and can be deployed in denser networks to measure air quality networks and better understand human exposure levels. Ozone monitoring is critical for air quality management and experimental studies of atmospheric chemistry, such as the interaction of ozone with atmospheric and Earth surface chemicals.The existing traditional photometric ozone monitoring instruments are all based on ultraviolet absorption, require a high sampling gas flow rate greater than 1L/min, and consume a lot of power.
These types of ozone sensors are usually too expensive and limited by environmental conditions, such as in smog chamber simulation experiments, where the volume or flow rate of gas is insufficient to be measured by the gas sensor. Another challenge is that such devices or instruments are tied to their fixed location, making them immobile and connected to AC power in the secure facility. Ground-level ozone is not emitted directly into the ambient air, but is formed as a result of a chemical reaction between volatile oxides (VOCs) and nitrogen oxides (NOX).
These air pollution particles are emitted by automobiles, power plants, refineries, boilers and chemical plants. Ground-level ozone increases on hot sunny days in urban environments and can also reach rural areas due to wind transport.
Ozone present in the air we breathe can be harmful, causing respiratory and other diseases in humans. High exposures can affect ecosystems and vegetation, including parks, forests, and wilderness areas. Therefore, conservation agencies must regularly assess ozone levels; this information can be obtained from daily air quality or weather monitoring.
The Future of Ozone Sensors
More research has been done to produce affordable, mobile, and less bulky ozone sensors that do not require high flow rates to detect ozone concentrations. Doing so will improve air quality monitoring, improve our understanding of atmospheric chemistry, and prevent damage to the ozone layer from chemicals released by human activities.
