It is the use method of laser pointer

 It is the use method of laser pointer . 
In the normal instrument operation does not need to. More specific information detailed in Chapter IV. The laser classification. According to the test gas when operating within the near infrared range between 700-2400nm laser gas analyzer, using a diode laser. The laser output power, according to the classification of the latest version of IEC 60825-1, the laser gas analyzer as a class of laser products. Note: The laser emission is not visible when determining the installation location of the laser gas analyzer, before the measurement point, we recommend 5 minimum flue diameter straight pipes after the measurement point to recommend the direct delivery of two flue diameter tube. Analyzer placement. The customer can choose the most suitable and appropriate kind of laser pointer .
Emission unit and receiver unit must be accessible. A person should be able to stand in the front of the transmitting unit or receiving unit, using two standard wrench to adjust the M16 screws. For the receiving unit, shown in Table 2-1, distance flange installed in the flue and it measured outward should have free space of 1 m. Table 2-1: The transmitter and receiver mounting tolerances. Flange and the requirements of the flue opening. Analyzer requires two holes relative, which are located on both sides of the diameter, the diameter of at least 50mm. The standard flange is used to connect the inner diameter of 50mm, outer diameter 165mm DN50/PN10 flange. The flange can be installed directly in the operation, for security reasons, can also act as a valve connected to the process. The measuring principle is known as infrared singlet absorption spectrum. It is based on this fact: most of the gas absorb specific wavelengths of light. The absorption of flue gas content is a direct reflection of. The customer can choose the suitable laser beam color for laser pointer .
The measurement principle is described in Table 1-1. The diode laser wavelength by scanning the selected absorption lines. Due to absorption of the diode laser and detector light on the road of the specific gas molecules, detecting the light intensity change due to the wavelength of the laser. In order to increase its sensitivity, the use of wavelength modulation technique: scan absorption lines, the laser wavelength will be a slight adjustment. The second harmonic signal is used to measure the concentration of absorbing gases. Since a specific wavelength, the absorption lines of other gases do not exist, so there is no direct interference from other gases. The measurement of gas concentration and absorption lines of the amplitude is proportional to the.