This report. Describes the design and construction of laser distance meter can measure the distance not exceeding 5 meters. The principle of measuring phase difference.15 MHz with diode laser to the desired object distance measuring The receiving photodiode light reflected from the object to meter. The light reflected back to a phase change from the original.Determination of phase difference with the way the difficulty in high frequency. To use a mixture of frequency to reduce frequency carrier. Which will help the circuit part for different phase less complicated
.By mixing the frequency F (frequency carrier - 1kHz: 14.999 MHz) with a carrier frequency and frequency F mixed with frequency carrier return to a phase difference. ซึ่งความถี่ F is close to the frequency carrier.7Segment by the circuit, signal circuit signal circuit and a phase lock loop to help control the frequency as needed. In order to make the measurement more accuracy
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