Even the customer drops green laser pointer on the floor accidentally
Thus the high-frequency signal phase measurement using most of the difference frequency. High-frequency signals into low-frequency signals (synchronous demodulation), then the phase difference measurement is the so-called "differential frequency measurement. Difference frequency measured relative to the principle of Figure (6-20) as shown in the circuit part. Set the master oscillation signal (Figure vibration ") of the signal launched into the optical path after a certain distance from the spread of the phase change, the signal was optoelectronic receiver amplifier into a set of local oscillator signal (Figure LO ") delivered to the mixerâ… and II, where, respectively, and mixing the output of the mixer difference frequency reference signal and ranging signals. Actually, the safety lock of green laser pointer is one of the biggest selling points of this kind of green laser pointer .
Known by the last two equations, the difference frequency of two low-frequency signal and the phase difference still retains the original high-frequency signal and the phase difference. Usually selected to measure the low-frequency frequency for thousands of Hz to tens kHz. After the input phase of the difference frequency of the low frequency signal meter comparison can detect the phase difference. Finally, It should be noted, laser range finder has many advantages, but a strong dependence of its climate. Can be measured in clear weather from the larger, in fog or rainy days, the distance can be measured is greatly reduced, if not impossible to measure. This is the biggest drawback of the laser range finder (course general geodimeter,, this shortcoming is more serious), laser rangefinder and can not completely replace other rangefinder. It is important in manufacturing green laser pen .
Can be further made on the basis of the laser range finder, laser radar. It can not only measure the distance of the target, but also to detect the target position, velocity and acceleration in order to track the target. Compared with the wireless radar, laser radar, the most important advantage is that the anti-jamming performance of confidentiality, and the device is lightweight, low power consuming and the role of distance, high measurement accuracy. Similarly, the laser radar is also affected by climatic conditions limit the beam divergence angle is narrow, does not facilitate the search of a large area. Lidar can not completely replace the radio radar, they can complement each other to form a multi-band, anti-jamming radar systems. For the material of green laser pointer can determine the quality of the china laser pointer to a large extent.
Measurement of laser alignment and multi-degree of freedom. Laser with excellent direction, a continuous output of the laser beam collimation, it can be considered to be a thickness of almost the same straight line. Therefore, you can use the laser beam as the space baseline. This laser collimator capable of measuring the level value of the degree of flatness, parallelism, perpendicularity, and could also serve as the basis of the measurement of three-dimensional space. Laser alignment collimator and the collimator, the theodolite general collimator compared with long working distance, high accuracy, ease of automatic control, convenient operation, etc., so widely used in tunneling, laying pipes, cover high-rise buildings, bridge-building roads, mining and large-scale equipment installation and positioning. usa green laser pointer will have the perfect quality.
Laser excellent monochrome, so you can use the diffraction theory to facilitate alignment of the diffraction spot (such as cross bright lines) to further improve the alignment accuracy of the laser collimator collimators [1], the production of laser diffraction. The laser collimator. Principles and structure of the laser collimator. The laser collimator generally helium-neon laser with continuous output, and commonly used is the output of the fundamental transverse membrane. The cross section of the laser beam intensity distribution is Gaussian distribution, the beam energy is mostly concentrated in the effective radius for the cross-section of the ωz0. Light intensity laser beam center connection of its distribution centers can constitute an ideal collimator baseline. Due to diffraction effects, the beam is slightly divergent, spot radius ωz0 also increased with the increase of propagation distance. The material of blue laser pointer is of good quality.