超聲測(cè)距系統(tǒng)設(shè)計(jì)外文資料翻譯-文庫吧資料
2025-07-06 12:21本頁面
【正文】 2是相同的建設(shè)為測(cè)量單位的10個(gè)，因此，包括一電發(fā)射機(jī)50個(gè)，其中包括壓電材料52夾心之間的一對(duì)電極的54和56 ，和一電接收機(jī)58 ，其中包括壓電材料60夾心階層之間的一對(duì)電極60,61,62和64 。變送器50和接收五十八頃間隔，除了已知的和固定的參考距離“博士” 。輸出探測(cè)器68是耦合的脈搏，前70產(chǎn)生觸發(fā)脈沖。觸發(fā)脈沖從脈沖前70也適用于反78 。因此，振蕩器42和76都在運(yùn)作，頻率和脈沖發(fā)電機(jī)40和第72條提供平等的輸出脈沖寬度。雖然留級(jí)率的脈沖在測(cè)量單位， 10和參考資料股十二頃每個(gè)溫度和濕度的依賴性，能證明的距離D來衡量。這種關(guān)系是獨(dú)立于雙方的溫度和濕度。微處理器90是適當(dāng)?shù)某绦蛱峁┝艘粋€(gè)輸出是成正比的比例，產(chǎn)出的柜臺(tái)46和78 ，這反過來又是成正比的重復(fù)率分別觸發(fā)脈沖列車的測(cè)量單位， 10和參考資料股12 。 實(shí)驗(yàn)表明，當(dāng)之間的距離發(fā)射和接收傳感器是太小了，思考的聲波在傳感器的表面有一個(gè)不小的作用，降低了測(cè)量精度。 因此，已披露的改善儀器的測(cè)量距離，利用超聲波。附件2：外文原文（復(fù)印件）Ultrasonic distance meterDocument Type and Number:United States Patent 5442592 Abstract:An ultrasonic distance meter cancels out the effects of temperature and humidity variations by including a measuring unit and a reference unit. In each of the units, a repetitive series of pulses is generated, each having a repetition rate directly related to the respective distance between an electroacoustic transmitter and an electroacoustic receiver. The pulse trains are provided to respective counters, and the ratio of the counter outputs is utilized to determine the distance being measured. Publication Date:08/15/1995 Primary Examiner:Lobo, Ian J. BACKGROUND OF THE INVENTION This invention relates to apparatus for the measurement of distance and, more particularly, to such apparatus which transmits ultrasonic waves between two points. Precision machine tools must be calibrated. In the past, this has been acplished utilizing mechanical devices such as calipers, micrometers, and the like. However, the use of such devices does not readily lend itself to automation techniques. It is known that the distance between two points can be determined by measuring the propagation time of a wave travelling between those two points. One such type of wave is an ultrasonic, or acoustic, wave. When an ultrasonic wave travels between two points, the distance between the two points can be measured by multiplying the transit time of the wave by the wave velocity in the medium separating the two points. It is therefore an object of the present invention to provide apparatus utilizing ultrasonic waves to accurately measure the distance between two points. When the medium between the two points whose spacing is being measured is air, the sound velocity is dependent upon the temperature and humidity of the air. It is therefore a further object of the,present invention to provide apparatus of the type described which is independent of temperature and humidity variations. SUMMARY OF THE INVENTION The foregoing and additional objects are attained in accordance with the principles of this invention by providing distance measuring apparatus which includes a reference unit and a measuring unit. The reference and measuring units are the same and each includes an electroacoustic transmitter and an electroacoustic receiver. The spacing between the transmitter and the receiver of the reference unit is a fixed reference distance, wherea
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