外文資料翻譯---超聲波測(cè)距儀-其他專(zhuān)業(yè)-資料下載頁(yè)
2025-01-19 10:24本頁(yè)面
【導(dǎo)讀】量單元和參考資料。在每一個(gè)單位，重復(fù)的一系列脈沖的產(chǎn)生，每有一個(gè)重復(fù)率，該脈沖序列提供給各自的計(jì)數(shù)器，計(jì)數(shù)器的產(chǎn)出的比率，是用來(lái)確定被測(cè)量的距離。不過(guò)，使用這種裝置并不利于本身的自動(dòng)化技術(shù)發(fā)展。據(jù)了解，兩點(diǎn)之間的距。這項(xiàng)距離測(cè)量?jī)x器發(fā)明是根據(jù)上述的一些條件和額外的一些基礎(chǔ)原則完成的，參考和測(cè)量單位是相同的，每個(gè)包括一個(gè)超聲。間隔發(fā)射器和接收器的參考值是一個(gè)固定的參考距離，而。間距之間的發(fā)射機(jī)和接收機(jī)的測(cè)量單位是有最小距離來(lái)衡量的。率脈沖是成反比關(guān)系之間的距離發(fā)射器和接收器。壓電式超聲波發(fā)生器實(shí)際上是利用壓電晶體的諧振來(lái)工作的。頻率等于壓電晶片的固有振蕩頻率時(shí)，壓電晶片將會(huì)發(fā)生共振，并帶動(dòng)共振板振動(dòng)，端口輸出一個(gè)40kHz的脈沖信號(hào)，經(jīng)過(guò)三極管T放大，驅(qū)動(dòng)超聲波發(fā)射頭UCM40T，發(fā)出40kHz的脈沖超聲波，且持續(xù)發(fā)射200ms。接收頭采用與發(fā)射頭配對(duì)的UCM40R，將超聲波調(diào)制脈沖變?yōu)榻蛔冸妷盒盘?hào)，錄超聲波發(fā)射的時(shí)間和收到反射波的時(shí)間。
【正文】 rrupt service routine return: SETB EX1。 open external interrupt 1 pop? acc pop? psw reti right: ...?。 right location entrance circuit interrupt service routine ? Ajmp? Return left: ...。 left Ranging entrance circuit interrupt service routine ? Ajmp? Return 3, the calculation of ultrasonic propagation time When you start firing at the same time start the singlechip circuitry within the timer T0, the use of timer counting function records the time and the launch of ultrasonic reflected wave received time. When you receive the ultrasonic reflected wave, the receiver circuit outputs a negative jump in the end of INT0 or INT1 interrupt request generates a signal, singlechip microputer in response to external interrupt request, the implementation of the external interrupt service subroutine, read the time difference, calculating the distance . Some of its source code is as follows: RECEIVE0: PUSH PSW PUSH ACC CLR EX0。 related external interrupt 0 ? MOV R7, TH0。 read the time value MOV R6, TL0? CLR C MOV A, R6 SUBB A, 0BBH。 calculate the time difference MOV 31H, A。 storage results MOV A, R7 SUBB A, 3CH MOV 30H, A? SETB EX0。 open external interrupt 0 POP ACC? POP PSW RETI , the ultrasonic ranging system software design Software is divided into two parts, the main program and interrupt service routine, shown in Figure 3 (a) (b) (c) below. 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. E. 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, CX20216 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
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