Trace gas analyzer

　　Trace gas analyzerThe principle is mainly based on various physical and chemical techniques to detect and measure extremely low concentrations of gases in the environment. The most common methods include spectroscopic techniques and mass spectrometry.

　　spectral technologyFor example, infrared absorption spectroscopy determines the concentration of a target gas by measuring the absorption of specific wavelengths of infrared radiation by a sample.

　　mass spectrometryUsing the principle of ionization and separation of gas molecules, the target gas is identified and measured by measuring the mass of ionized gas molecules.

When the gas concentration is below the ppm (parts per million) level, traditional sensors will fail. Trace analysis requires capturing molecules at the level of micrograms per cubic meter, equivalent to:

Position 1 piece of salt in a standard swimming pool

Identify 80 specific individuals from the Earth's population

Core Technology Showdown: Three Principles of Hypersensitivity Detection

1. Cavity Ring Down Spectroscopy (CRDS): The Optical Path Revolution

workflow

Laser reflects tens of thousands of times in an optical cavity with a reflectivity greater than 99.9995%, with an equivalent optical path length of 20 kilometers

Gas molecules absorb photons of specific wavelengths, causing light intensity attenuation

Precision timer measures photon decay time (accuracy 0.1 μ s)

Breakthrough advantage:

Ammonia (NH?) detection limit of 0.05ppb (3 orders of magnitude higher than electrochemical method)

Temperature drift compensation technology controls long-term drift within<1%/month

2. Integral cavity output spectroscopy (ICOS): anti vibration

Special design for in vehicle/airborne scenarios:

Coaxial cavity structure: eliminates lens micro vibration offset (resistant to 5G vibration)

Multi laser beam scanning: simultaneous capture of methane/ethane/propane (C1 to C3)

During the inspection of natural gas pipelines, an accuracy of ± 2ppb can be maintained at a speed of 60km/h

3. Quantum Cascade Laser (QCL): Dominator in the Mid Infrared Region

Unlock molecular 'fingerprint area' (3-12 μ m band):

Detecting SF? (Strong Greenhouse Gas) with a sensitivity of 0.01 ppt

Laser linewidth<0.0001cm?? Increase resolution by a hundredfold

Applied to greenhouse gas monitoring stations on the Qinghai Tibet Plateau

Features:

　　High detection accuracyBeing able to detect trace amounts of gas components, it is usually more accurate than other gas analyzers.

　　high sensitivityIt can accurately detect the presence of gas and is less affected by interference from other substances.

　　Widely applicable adaptabilityNot only applicable to environmental monitoring, but also widely used in various fields such as industrial production and scientific research.

Usage steps:

　　Prepare instruments and samplesPut the gas sample to be tested into the analyzer and connect and set it according to the instructions.

　　preprocessingRemove impurities from the sample to ensure the accuracy of the test results. The preprocessing method may include adsorption, cooling, heating, etc., depending on the sample and testing requirements.

　　calibrationEnsure the accuracy of the instrument through zero calibration and range calibration.

　　take measurementsStart the measurement program and wait for the instrument to stabilize before reading the data.

Analysis method:

　　Concentration analysisDirectly read the gas concentration value displayed by the instrument to understand the gas concentration in the sample.

　　trend analysisContinuously monitor and record data, analyze the trend of gas concentration changes.

　　comparative analysisCompare measurement data from different times and locations to evaluate the distribution and changes of gases.

　　Trace gas analyzerIt is a high-precision and high-sensitivity gas detection device based on principles such as spectroscopy and mass spectrometry. It is widely used in fields such as environmental protection, industrial production, and scientific research, providing important technical support for safety and quality control in related industries.