超聲測距系統(tǒng)英文翻譯-資料下載頁
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【正文】 POP ACC POP PSW RETI For a flat target, a distance measurement consists of two phases: a coarse measurement and. a fine measurement:Step 1: Transmission of one pulse train to produce a simple ultrasonic wave.Step 2: Changing the gain of both echo amplifiers according to equation , until the echo is detected.Step 3: Detection of the amplitudes and zerocrossing times of both echoes.Step 4: Setting the gains of both echo amplifiers to normalize the output at, say 3 volts. Setting the period of the next pulses according to the : period of echoes. Setting the time window according to the data of step 2.Step 5: Sending two pulse trains to produce an interfered wave. Testing the zerocrossing times and amplitudes of the echoes. If phase inversion occurs in the echo, determine to otherwise calculate to by interpolation using the amplitudes near the trough. Derive t sub m1 and t sub m2 .Step 6: Calculation of the distance y using equation .4. The ultrasonic ranging system software design Software is divided into two parts, the main program and interrupt service routine. Completion of the work of the main program is initialized, each sequence of ultrasonic transmitting and receiving control. Interrupt service routines from time to time to plete three of the rotation direction of ultrasonic launch, the main external interrupt service subroutine to read the value of pletion time, distance calculation, the results of the output and so on. 5. Conclusions Required measuring range of 30cm ~ 200cm objects inside the plane to do a number of measurements found that the maximum error is , and good reproducibility. Singlechip design can be seen on the ultrasonic ranging system has a hardware structure is simple, reliable, small features such as measurement error. Therefore, it can be used not only for mobile robot can be used in other detection systems. Thoughts: As for why the receiver do not have the transistor amplifier circuit, because the magnification well, integrated amplifier, but also with automatic gain control level, magnification to 76dB, the center frequency is 38k to 40k, is exactly resonant ultrasonic sensors frequency REFERENCES1. Fox, ., KhuriYakub, . and Kino, ., High Frequency Acoustic Wave Measurement in Air, in Proceedings of IEEE 1983 Ultrasonic Symposium, October 312 November, 1983, Atlanta, GA, pp. 5814.2. Martin Abreu, ., Ceres, R. and Freire, T., Ultrasonic Ranging: Envelope Analysis Gives Improved Accuracy, Sensor Review, Vol. 12 No. 1, 1992, pp. 1721.3. Parrilla, M., Anaya, . and Fritsch, C., Digital Signal Processing Techniques for High Accuracy Ultrasonic Range Measurements, IEEE Transactions: Instrumentation and Measurement, Vol. 40 No. 4, August 1991, pp. 75963.4. Canali, C., Cicco, ., Mortem, B., Prudenziati, M., and Taron, A., A Temperature Compensated Ultrasonic Sensor Operating in Air for Distance and Proximity Measurement, IEEE Transaction on Industry Electronics, Vol. IE29 No. 4, 1982, pp. 33641.5. Martin, ., Ceres, R., Calderon, L and Freire, T., Ultrasonic Ranging Gets Thermal Correction, Sensor Review, Vol. 9 No. 3, 1989, pp. 1535. 14
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