The customer should pay some attention to the use of green laser pointer

The customer should pay some attention to the use of green laser pointer .
The system uses the laser ranging of the phase method, the first processing mixer before the test phase, to make the measurement easier and feasible, and the use of advanced frequency-domain digital measuring phase method and the improved fast Fourier transform, making the computation of the DFT greatly simplify, and ultimately achieve high-precision measurement and alarm, automatic braking operation to prevent the collision. Phase France ranging basic principles. Laser ranging of the phase method using continuous modulation of the laser beam irradiation measured object and receives the reflected light contains the distance of the phase difference between light waves in the emission light receiving light information to the target distance measurement. Set light to the speed c in the atmosphere transmission, the modulation wave frequency f, the distance between the tested two d, round-trip time for t2d.
After initialization is complete, the system wait state into the keyboard scan. A key is to determine the stop button or set the button, stop button and the system stops running if it is to set the state to complete the setup into the interrupt subroutine. When there are stop key is pressed, the system stops running. Interrupt subroutine flow chart shown in Figure 3. Fourier transform to transform the signal from the time domain signal into the frequency domain signal, and thus the signal in the frequency domain analysis is an important tool. FFT significantly reduces the intensity of the DFT operation, the DSP technology to achieve "real-time spectrum analysis has an important value. The principle of the FFT is many little easier to carry out the transformation to achieve large-scale transformation. green laser pointer is the good tool and assistant for the user.
Sampling domain decomposition of the system selected method (DIT), this method is the point of odd and even points of the input sequence were extracted to form a sequence of two N / 2 points to carry out the DFT, the intermediate results generated by N / 2 times the 2-point DFT synthesis, the desired output results. The one-dimensional discrete Fourier transform of the formula: where n is enter the serial number of the discrete signal f (n), m is the serial number of the converted F (m), known as the butterfly factor. Sampling points and the sampling frequency relationship using serial binary signal frequency and DFT is: where, f is the signal frequency, Δf is the frequency resolution, fs is the sampling frequency of the A / D conversion, m is the emergence of power spectrum maximum frequency of the serial number.