chanelink logo
CHANELINK
Русский

The Science Island team has made new progress in detecting atmospheric formaldehyde

844
2023-09-21 14:34:23
Посмотреть перевод

Recently, Zhang Weijun, a research team of the Anguang Institute of the Chinese Academy of Sciences, Hefei Academy of Materials, made new progress in atmospheric formaldehyde detection, and the related achievements were published on the international TOP journal Sensors and Actors: B. Chemical under the title of "Portable highly sensitive laser absorption spectrum formaldehyde sensor based on compact spherical mirror optical multi-path cell".

Formaldehyde is an important atmospheric pollutant, mainly originating from industrial processes, chemical products, and motor vehicle emissions. In atmospheric chemistry, formaldehyde is a key intermediate product in the oxidative degradation process of volatile organic compounds (VOCs) emitted by humans and nature; In indoor environments, excessive formaldehyde levels are an important cause of cancer, especially leukemia. Therefore, real-time monitoring of atmospheric formaldehyde is of great significance for the study of atmospheric pollution chemistry and health effects.

In 2019, researcher Zhao Weixiong and assistant researcher Fang Bo from An Guang Institute team developed a TDLAS device for actual atmospheric formaldehyde measurement using a long path new spherical mirror cell combined with mid infrared tunable laser absorption spectroscopy (TDLAS) technology. They also participated in field observations in the Guangdong Hong Kong Macao Greater Bay Area and other areas.

Based on this research, a compact optical multi-pass cell with high optical path to volume ratio (optical path 50.6 m, volume~350 mL) was developed to meet the miniaturization, fast response, and high sensitivity development needs of TDLAS formaldehyde measurement devices. Its gas displacement response time is less than 1 second. Combined with fast background subtraction technology, this device can obtain 650 pptv in 1 second of integration time（ α Min~2.3 × Detection limit of 10-9 cm-1). This research work laid the foundation for the team to further develop portable handheld/vehicle formaldehyde detection equipment.

This work has been supported by the National Natural Science Foundation of China, the Youth Innovation Promotion Association of the Chinese Academy of Sciences, and the President's Fund of Hefei Research Institute.

Compact spherical mirror optical multi pass cell with high optical path volume ratio


Structure diagram of formaldehyde detection device


Fast background subtraction and detection limit


Source: Hefei Institute of Physical Sciences, Chinese Academy of Sciences

Связанные рекомендации

  • Changing Optical Design: How Multi scale Simulation Improves the Efficiency of Modern Devices

    Optical equipment is an integral part of technologies such as data centers and autonomous vehicle, which are constantly developing to meet the needs of complex applications. The challenge faced by designers is to manipulate light at the wavelength scale to achieve the required optical properties, which requires precision at both the nano and macro scales. Nanoscale structures, such as those on LED...

    2024-03-02
    Посмотреть перевод

  • The influence of laser beam drift on SLM thin-walled TC11 specimens at high scanning speed

    AbstractDue to the width of the laser melt pool and the sintering effect on the surrounding powder, the experimental size of the selective laser melting (SLM) sample will be larger than the design size, which will greatly affect the dimensional accuracy and surface quality of the thin-walled sample. In order to obtain SLM thin-walled TC11 specimens with precise dimensions, an orthogonal experiment...

    02-24
    Посмотреть перевод

  • Breakthrough in optical quantum simulation using long-lived polariton droplets

    Abstract: A groundbreaking discovery by CNR Nanotec and scientists from the University of Warsaw has revealed a robust method for creating long-lived quantum fluids using semiconductor photonic gratings. This study, published in the journal Nature Physics, marks a significant step forward in simulating complex systems through unique polariton droplets that demonstrate stability in lifespan and rec...

    2024-03-27
    Посмотреть перевод

  • An innovative technology that can make light "bend"

    A research team from the University of Glasgow in the UK drew inspiration from the phenomenon of clouds scattering sunlight and developed an innovative technology that can effectively guide or even "bend" light. This technology is expected to achieve significant breakthroughs in fields such as medical imaging, cooling systems, and even nuclear reactors. The relevant research results were published...

    2024-11-11
    Посмотреть перевод

  • Xi'an Institute of Optics and Fine Mechanics has made significant progress in the field of metasurface nonlinear photonics

    Recently, the Research Group of Nonlinear Photonics Technology and Application in the Transient Optics Research Room of Xi'an Institute of Optics and Mechanics, Chinese Academy of Sciences has made important progress in the field of super surface nonlinear photonics. Relevant research results were published in Laser&Photonics Reviews (IF=9.8), the top journal of the first district of the Chine...

    04-30
    Посмотреть перевод