And if the customer releases the button of laser pointer

And if the customer releases the button of laser pointer
Basically divided into the following situation: the case of distance measurements, and less precision within a few meters or 10 meters range. Advice - the ultrasonic range finder can be used. Note - The effect of ultrasonic distance measurement influenced by the environment, stability and the direction is worse than the laser range finder, but the price is relatively cheap, suitable for measuring and interior. Measuring distance is not long, used for indoor, high precision. Advice - buy a handheld laser range finder. Note - the most handheld laser rangefinder for indoor use, measurement accuracy and the results are very good. Such as user detection in the outdoor environment, professional recommendations coupled with laser sight and the reflector used in combination to achieve the desired measurement range and effect. laser pointer have the same power but different wavelength and laser beam color.
Measure the distance, and more for outdoor use. Advice - buy the telescopic laser rangefinder ". Handheld laser range finder. Measure distances generally within 200 meters, the accuracy is about 2mm. This is currently the most widely used laser range finder. Can measure the distance, the general function can calculate the volume of the measurement object. The main brands are: Hilti HILTI range finder, the LEICA Leica DISTO range finder, BOSCH Bosch rangefinder domestic great rangefinder, Fluke rangefinder. Telescope laser range finder. Measure distances of 600-3000 meters, this type of rangefinder measurements from a distance.  This kind of laser pointer is equipped with the line lens. The pulse function of laser pointer is the newly emerging technology
Increase the probability of detection error decreases; if the signal measurement of total correlation and noise, the net SNR is obtained from the measurement n times unrelated to the net the SNR; the SNR for a single measurement of signal to noise ratio. Receiver bandwidth of the system-wide SNR. Bandwidth is too wide to enter the excess noise; the contrary, some of the useful signal suppression. Inhibitory signal or excessive noise will reduce the SNR. Therefore, the laser radar receiver bandwidth to balance the system the SNR. Pseudo-random m sequence in the laser range finder. Figure 1 is a block diagram of the laser range finder, pseudo-random sequence diagram, the digital signal processor (DSP) as the system's real-time digital signal processor to achieve real-time signal processing and control.
For in situ detection level segment of the balloon sounding too high, too low for satellite detection level segment on the radio remote sensing of the ground; remote sensing, mostly belonging to the blind, while the satellite from down the passive optical remote sensing and the shortcomings of the resolution and accuracy.