Whether the use of green laser pointer will affect others or not

green laser pointer should be used in the suitable occasion in the appropriate way.
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.
Its block diagram shown in Figure 1. The laser unit including the generation of the direct signal modulation wave signal frequency synthesizer (DDS) and the laser driver circuit. The system selected DDS is a four-channel high-speed direct signal frequency synthesizer AD9959 AD company. Processor through the SPI interface to DDS write control word to produce two similar frequency sinusoidal signal, respectively, as the local oscillator signal and the LO signal. LCD unit with TFT-LCD liquid crystal display. DSP processor through the PPI port drive on the TFT screen and real-time display of images and distance; alarm unit uses TI's TLV320AIC23B Audio Codec chip connection BF533 processor SPORT port, the audio alarm. The cost of parts and components of green laser pointer is higher.The finished product of green laser pointer should be passed through
The laser receiver unit avalanche diode received light signals into electrical signals, after mixer AD831 mixer processing, the use of the AD converter is converted into digital signals through the SPI port to enter the microprocessor. Microprocessor using FFT algorithm to calculate the phase difference, according to the algorithm were taken to the police or the brake handle. The software part of the system using C language, the signal simulation using MATLAB, the ultimate in Visual DSP + + environment, compiled. The software flow diagram shown in Figure 2. The first system power-up initialization, including setting the stack pointer, initialize the LCD, DDS, clock, etc.. green laser pointer can irradiate to a long distance.