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 Wysłany: Czw 23:00, 10 Lut 2011 Temat postu: Doppler effect experimental apparatus based on sin |
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Doppler effect experimental apparatus based on single chip design
● _______ an optical gate 1 - a INT0P36. . . . . . . . . . . . ______ ● __________ a photoelectric door 2 - A 【Ding 1P20. . . . . . . . . . . . 852 I leather machine P21 speaker power amplifier Doppler effect experiment I Figure 1 Figure 2 Instrument circuit single-supply amplifier 6V. Figure 2 is the output dynamic range is approximately 6V AC power amplifier, magnification: A = l +. Microphone amplifier LM358 op amp with a composition, is a single power supply, circuit similar to Figure 2, Figure omitted. 2.2 The motor system of the circuit shown in Figure 3 probe, M, suspended from AC SSR solid state relay control, reversing motor with a DPDT relay control. Motor reversal, 89C52 the P36 output high, transistors 8550 deadline, SSR end, cut off electrical power; and then the P37 89C52 output high, transistor 8050 turns on,[link widoczny dla zalogowanych], relay J action, reverse the motor current; final 89C52 of the P36 output low, transistor 8550 turns on, solid-state relay SSR conduction, motor reversal. As with the SSR motor reversal off the power first, and then make the current reverse relay, SSR non-contact,[link widoczny dla zalogowanych], through a program not at 9c52 - P20P36rP378050 ,[link widoczny dla zalogowanych], Figure 3, electrical motors automatically adjust the motor reversing control reversal delay time, and thus long life, without interference. Figure 3 is a limit switch SW, when the car moves to the right end point rail,[link widoczny dla zalogowanych], SW closed, 89C52 of the P20 pin goes low, then 89C52 to control the motor stopped or reversed. SW work in low-pressure limit switch low current, and thus longer life. Software design for a 42-3 Figure 4 is a software flow chart. 89C52 microcontroller on reset, the first set flag, assign the initial value, indicating the initial state,[link widoczny dla zalogowanych], and then detect whether a key is, if no key is pressed, wait; if key is pressed, the implementation of key subroutines. In the Press Right side rail as a starting point for each experiment. And motor-driven car to the left, 89C52 car movement measuring time and the microphone signal frequency, when the car door after a second optical stop. In order to measure Doppler effect reverse movement of the car, the motor for 2 seconds after the auto-reverse, the car moves to the right, 89C52 measuring time and frequency, until the right end of the trip switch SW connected to the car stopped, to complete a measurement cycle. Measuring time and frequency displayed on the LCD screen. 4 of 4 results circle circle over parts of Jing Jiang experiments show that the Doppler effect of the experimental apparatus mechanical transmission smooth, sensitive motor control, with software and hardware protection. 89C52 timing accuracy of ± 1ms, frequency measurement error is less than 1%, stable and reliable signal amplification along, LCD display clearly. The experimental apparatus used in experiments in college physics for half a year, teaching good effect.
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