Near infrared TDLAS NH3 (ammonia) ppm concentration analysis system 1512nm

TDLAS (Tunable Diode Laser Absorption Spectroscopy) is a new gas detection method developed by combining a diode laser with a long path absorption cell, which uses laser wavelength modulation to pass through the characteristic absorption region of the measured gas. The spectrum of the semiconductor laser source used in TDLAS technology has a width much smaller than the broadening of gas absorption lines, resulting in a single line absorption spectrum. Therefore, TDLAS technology is a high-resolution absorption spectroscopy technique. Ammonia: NH3 is a colorless gas with a strong pungent odor, lighter than air. This gas usually comes from concrete admixtures used in construction and additives and whitening agents in interior decoration materials. Long term exposure to ammonia can burn the skin, eyes, and mucous membranes of respiratory organs. If a person inhales too much ammonia, it can cause lung swelling and even death.

Near infrared TDLAS CH4 (methane) ppb level concentration analysis system 1653.73nm

TDLAS (Tunable Diode Laser Absorption Spectroscopy) is a new gas detection method developed by combining a diode laser with a long path absorption cell, which uses laser wavelength modulation to pass through the characteristic absorption region of the measured gas. The spectrum of the semiconductor laser source used in TDLAS technology has a width much smaller than the broadening of gas absorption lines, resulting in a single line absorption spectrum. Therefore, TDLAS technology is a high-resolution absorption spectroscopy technique. Methane: CH4, commonly known as gas, is widely distributed in nature and is the main component of natural gas, biogas, pit gas, etc. At room temperature under standard pressure, methane is colorless and odorless. It can be used as a fuel and a raw material for the production of substances such as hydrogen, carbon black, carbon monoxide, acetylene, hydrogen cyanide, and formaldehyde. Methane is generally non-toxic to humans, but when its concentration is too high, it significantly reduces the oxygen content in the air, causing suffocation.

7.4um QCL combined with 5-meter long optical path miniaturized Mini hollow fiber gas chamber gas analysis system for analyzing H2O in air

Theoretical basis 1. Bill Lambert law: When a laser passes through a gas with a concentration of C, when the wavelength of the laser is the same as the center frequency of a certain absorption spectrum line of the gas, gas molecules will absorb photons and transition to high energy levels, manifested as the attenuation of laser intensity in the gas absorption band. 2. Wavelength modulation spectroscopy technology. A) Tuning characteristics of lasers. DFB lasers, due to their good monochromaticity, narrow linewidth, and frequency tuning characteristics, can effectively avoid cross interference from other background gases, making the detection system have good measurement accuracy. Therefore, they are widely used in gas detection. B) Harmonic detection theory changes the current by adding a high-frequency sine voltage signal to the driving voltage of the laser, so that the output frequency also follows a sine waveform. Regular changes. By applying sawtooth voltage to the laser driver, the output wavelength is scanned on both sides of the gas absorption peak. The harmonic signal is modulated and demodulated using a lock-in amplifier to measure gas concentration. 3. The principle of selecting absorption spectral lines is crucial in gas detection, and the following aspects should be considered: (1) the selected spectral lines of the gas.........

Mid infrared TDLAS (sulfur dioxide) SO2 ppm concentration analysis system 7.4um

TDLAS (Tunable Diode Laser Absorption Spectroscopy) is a new gas detection method developed by combining a diode laser with a long path absorption cell, which uses laser wavelength modulation to pass through the characteristic absorption region of the measured gas. The spectrum of the semiconductor laser source used in TDLAS technology has a width much smaller than the broadening of gas absorption lines, resulting in a single line absorption spectrum. Therefore, TDLAS technology is a high-resolution absorption spectroscopy technique. Sulfur dioxide is a common, simple, and irritating sulfur oxide with the chemical formula SO2. It is a colorless gas and one of the main pollutants in the atmosphere. Sulfur dioxide is a colorless and transparent gas with a pungent odor. Dissolve in water, ethanol, and ether.

Near infrared TDLAS C2H2 (acetylene) ppb level concentration analysis system 1520nm

TDLAS (Tunable Diode Laser Absorption Spectroscopy) is a new gas detection method developed by combining a diode laser with a long path absorption cell, which uses laser wavelength modulation to pass through the characteristic absorption region of the measured gas. The spectrum of the semiconductor laser source used in TDLAS technology has a width much smaller than the broadening of gas absorption lines, resulting in a single line absorption spectrum. Therefore, TDLAS technology is a high-resolution absorption spectroscopy technique. Acetylene: C2H2, commonly known as wind coal or carbide gas, is the smallest volume member of alkyne compounds, mainly used for industrial purposes, especially in the field of welding metals. Acetylene is a colorless and highly flammable gas at room temperature. Pure acetylene is odorless, but industrial acetylene has a garlic odor due to impurities such as hydrogen sulfide and phosphine.

7.4um QCL combined with hollow fiber gas absorption cell analysis system (experimental analysis of H2O water in air)

1、 Theoretical basis 1. Bill Lambert law: When a laser passes through a gas with a concentration of C, when the wavelength of the laser is the same as the center frequency of a certain absorption spectrum line of the gas, gas molecules will absorb photons and transition to high energy levels, manifested as the attenuation of laser intensity in the gas absorption band. 2. Wavelength modulation spectroscopy technology. A) Tuning characteristics of lasers. DFB lasers, due to their good monochromaticity, narrow linewidth, and frequency tuning characteristics, can effectively avoid cross interference from other background gases, making the detection system have good measurement accuracy. Therefore, they are widely used in gas detection. B) Harmonic detection theory changes the current by adding a high-frequency sine voltage signal to the driving voltage of the laser, so that the output frequency also follows a sine waveform. Regular changes. By applying sawtooth voltage to the laser driver, the output wavelength is scanned on both sides of the gas absorption peak. The harmonic signal is modulated and demodulated using a lock-in amplifier to measure gas concentration. 3. The principle of selecting absorption spectral lines is crucial in gas detection, and the following aspects should be considered: (1) When selecting