AO2000 LS25 模块 激光分析仪 用于化工行业

AO2000 LS25 模块 激光分析仪 用于化工行业

该分析仪是一种基于可调谐二极管激光吸收光谱(TDLAS)的光学仪器，

用于对烟囱、 管道、工艺室或类似场所的气体进行连续现场监测。

该分析仪采用发射器/接收器配置(安装在直径 相对安装)来测量沿视线路径的平均气体浓度。

测量原理是红外单线吸收光谱，其依据是 每种气体在特定波长都有不同的吸收线。

测量原理 测量原理如图 1-1 所示。激光波长扫描所选的待测气体吸收线。

吸收线是经过精心挑选的，以避免其他(背景)气体的交叉干扰。其他(背景)气体的交叉干扰。

检测到的光强随激光波长的变化而变化。在发射器和接收器之间的光路中，目标气体分子会吸收激光波长。

发射器和接收器之间的光路中目标气体分子的吸收。为了提高灵敏度，采用了波长调制技术。

为了提高灵敏度，我们采用了波长调制技术：在扫描吸收线时对激光波长进行轻微调制。

检测器信号在光谱上被分解成激光调制频率的谐波频率分量。

信号的二次谐波用于 测量吸收气体的浓度。线幅和线宽都是 线幅和线宽都是从二次谐波线形中提取的，

因此测量的浓度对线形变化(线幅和线宽)并不敏感。对背景气体引起的线形变化(线宽效应)不敏感。

注：分析仪仅测量特定气体中游离分子的浓度，因此对与其他分子结合成复合物的 分子以及附着或溶解在颗粒和液滴中的分子不敏感。

在将测量结果与其他测量技术得出的结果进行比较时应小心谨慎。 

AO2000 LS25 模块 激光分析仪 用于化工行业

The analyzer is an optical instrument based on tunable diode laser absorption spectroscopy (TDLAS),

For continuous on-site monitoring of gases in chimneys, pipes, process rooms or similar places.

The analyzer uses a transmitter/receiver configuration (mounted in diameters relative to mounting) to measure the average gas concentration along the line of sight path.

The measurement principle is infrared single-line absorption spectrum, which is based on the fact that each gas has a different absorption line at a specific wavelength.

Measurement principles Figure 1-1 shows the measurement principles. The laser wavelength scans the selected absorption line of the gas to be measured.

The absorption lines are carefully selected to avoid cross interference from other (background) gases. Cross interference of other (background) gases.

The detected light intensity varies with the wavelength of the laser. In the light path between the transmitter and receiver, the target gas molecule absorbs the laser wavelength.

Absorption of target gas molecules in the optical path between transmitter and receiver. Wavelength modulation technique is used to improve the sensitivity.

In order to improve the sensitivity, we use wavelength modulation technology: the laser wavelength is slightly modulated while scanning the absorption line.

The detector signal is spectrally decomposed into harmonic frequency components of the laser modulated frequency.

The second harmonic of the signal is used to measure the concentration of the absorbed gas. Both the line width and the line width are extracted from the second harmonic line shape,

Therefore, the measured concentration is not sensitive to changes in line shape (line width and line width). It is not sensitive to the lineament change (linewidth effect) caused by background gas.

Note: The analyzer only measures the concentration of free molecules in a particular gas and is therefore not sensitive to molecules that bind to other molecules into complexes and molecules that are attached or dissolved in particles and droplets.

Caution should be exercised when comparing measurement results with those obtained by other measurement techniques.