It is the finished product area of green laser pointer

It is the finished product area of  green laser pointer 
As the relationship between the round trip time and distance between two points. Where, N is the phase difference Φ contains an integer multiple of 2π, ΔN is less than the whole wave number of the mantissa, the wavelength of λ of the modulated wave. L = 1 / 2λ known as the measuring tape length. In practical applications, due to unable to determine the value of N is taken to increase the modulation wavelength λ, measuring tape length L is greater than 2 times the measured distance d. The selected measurement range in this system is 100 m, ie the modulation wave length of 200 m, the modulation frequency is 1.5MHz. This system is using the ADSP-BF533 development platform designed high-precision laser ranging system. The whole system by a the BF533 minimum system development board, laser unit, the laser receiver unit, showing the composition of the unit, alarm unit and brake unit. Whether the use of green laser pointer will affect others or not.
CPU set pin P1.5 to "1", pull the relay K1, automatic hook function. 10 ringing process, the user connected to the phone, the controller does not respond, so that makes the controller and the phone does not interfere with each other. Hook, detect MT8888 output dual-tone multi-frequency signals to read out the remote information sent to the user, remote communications and control functions. After receiving wireless alarm signal sent to the pyroelectric sensors, the CPU immediately send alarm signals to spread to remote users via telephone lines. Alarm as follows: the user panel device 10 alarm calls, deposit them with the 24C04 memory. After receiving the alarm from a telephone dial-up, has been appropriated for the first 10 to call back three times.  green laser pointer  can bring much convenience to the client.green laser pointer had the longest development history
MS-LRF, the measurement principle: laser diode laser, respectively, by spectroscopic and micro-scanning plane mirror reflection toward the target. Received by the target laser part of the corner reflectors launch. Return along the original path. And, ultimately, to be sensitive avalanche photodiode to detect. MS-LRF applied to the formation of satellites requires a very high measurement accuracy and frame rate is a continuous wave laser phase-ranging. 5kHz and 1MHz two frequencies for 0.1> 10km inter-satellite distance from the semiconductor laser is modulated. The measurement accuracy of 1m. In summary, the laser ranging technology in space applications is increasingly widespread. These kinds of  green laser pointer are more expensive.It is due to abundant working experience of producing green laser pointer 
47μF capacitor can in addition to the DC component, thus eliminating the use of the environment (sun, light, fire source, etc.) impact on the detector, followed by a delay trigger circuit so that the master arm and disarm. Has been dedicated integrated chip BISS0001 of the above functions. In order to adapt to the need to disarm the master door design an alarm delay circuit. Delay length must be met: an alarm when the speed of 1m / s to move from the detector in front of 0.2m; mobile 3m should alarm, test speed should be able to detect the speed range of 0.3 ~ 3m / s or wider . Menci pass surprise. The wireless door sensor files in the top of the inside of the door.