Only the difference between the two depends on the composition and molecular scattering of light with the wavelength of light has nothing to do. thus can after the frequency shift of scattered light to identify the contaminated gas composition, and according to the size of the echo amplitude after the determination of concentrations of pollutants such as Japan, built in 1971, a mobile Raman lidar for monitoring stack emissions of sulfur dioxide, laser wavelength of 532 nm, the receiver telescope diameter of 50 cm, high-sensitivity optical detection part is synchronous single-photon counting equipment. People in this 100mW laser pointer company have always been committing to application of new technology.estimation of sulfur dioxide concentration of 1850ppm (1ppm is equivalent to parts per million by volume). differential absorption lidar can sensitively detect molecules of air pollution concentration, which is due to most of the pollution gas molecules in the mid-infrared spectral regions (2.5 microns to 25 microns) with a characteristic structure of the absorption lines, emission wavelength of this laser radar a few microns per cent short of the two lasers, one of the a right in the center of the molecular absorption lines measured on the other wavelength is deviated from the center of the absorption lines, but as far as possible in the low absorption of the test molecule laser radar receives the echo signals of these two wavelengths, through divider handle, you can eliminate the atmospheric attenuation and laser radar instrument parameters affect the accuracy of detection, to obtain the concentration of gas molecules under test.It’s not difficult any more for the Royo 200mW Laser Pointer company to manufacture electronic products with steady quality. Such laser radar wavelength of the laser emission demanding in the use of differential absorption measurement, if the signal is not received from the resolution of the echo signal, but the distance from the fixed targets such as mountains, trees, or corner reflectors of echo signals obtained at this time is the full integration test gas concentration with West Germany for the first time differential absorption lidar measurements of nitrogen dioxide in ambient air. differential absorption of long-term monitoring can be used for on-site monitoring of a given domain, such as the use of tunable dye laser to the reflector and the distance after the detection by differential absorption of sulfur dioxide in the plume chimney; It becomes easier for Royo green laster pointer company to produce products with reliable performance.with discrete tunable laser and long-distance reflector to detect nitrogen dioxide, and study the variation of concentration with time (2) clouds, precipitation and visibility of the probe laser to detect the height of cloud with accurate and rapid. lidar to cloud base emit a laser pulse, after a time t, the received echo signal clouds, according to the speed of light c and time t, can be derived from lidar cloud base of the slant range, elevation by the laser radar can be obtained the vertical cloud base height from the ground, such as the laser beam encounters the clouds and continue to transmit in the cloud, until through the clouds, stratus case of second or third layer, you can receive the second or third layer of stratus of laser echo, which can be identified at all levels of cloud height and thickness of elastic backscatter lidar is very easy to complete the general observation of cloud or cloud thickness and cloud top height measurements. Human-oriented products of Royo 10mW blue violet laser pointer company have become mainstream.optical radiation transmission medium in the atmosphere, atmospheric absorption and scattering attenuation of the light intensity are and if r is the distance measure light intensity I (r), the light transmission distance in the atmosphere per dr.