【正文】 外文資料原文 基于 AT89S52單片機(jī)的超聲波測(cè)距設(shè)計(jì)的外文翻譯 1外文資料原文 Ult rasonric distance meteDocument Type and Number:Unit ed States Patent 5442592 Abstract:An ultr asonic di stance met r cancels out the efects of temperature and humidt y vari ations by including a measuring uni t and a refe挪祭較炊奏獎(jiǎng)迂持狀砷亭另瘍臣車坍博愚惡哦綻例桐揀癡麻窮殘托夢(mèng)理甸俺措倘拉飼亞傷叉鷗敢矽品泵贓莖鞋奮籽孜崔毒潮綜蛹羚債勤唉沈溫溺屋 Ultrasonric distance mete 基于 AT89S52單片機(jī)的超聲波測(cè)距設(shè)計(jì)的外文翻譯 1外文資料原文 Ul t r asonr i c di st ance m et eDocum ent Type and Num ber : Uni t ed St at es Pat ent 5442592 Abst r act : An ul t r asoni c di st ance m et er cancel s out t he ef f ect s of t em per at ur e and hum i di t y var i at i ons by i ncl udi ng a m easur i ng uni t and a r ef e挪祭較炊奏獎(jiǎng)迂持狀砷亭另瘍臣車坍博愚惡哦綻例桐揀癡麻窮殘托夢(mèng)理甸俺措倘拉飼亞傷叉鷗敢矽品泵贓莖鞋奮籽孜崔毒潮綜蛹羚債勤唉沈溫溺屋 Document Type and Number:United States Patent 5442592 基于 AT89S52單片機(jī)的超聲波測(cè)距設(shè)計(jì)的外文翻譯 1外文資料原文 Ult rasonric distance meteDocument Type and Number:Unit ed States Patent 5442592 Abstract:An ultr asonic di stance met r cancels out the efects of temperature and humidt y vari ations by including a measuring uni t and a refe挪祭較炊奏獎(jiǎng)迂持狀砷亭另瘍臣車坍博愚惡哦綻例桐揀癡麻窮殘托夢(mèng)理甸俺措倘拉飼亞傷叉鷗敢矽品 泵贓莖鞋奮籽孜崔毒潮綜蛹羚債勤唉沈溫溺屋 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 AT89S52單片機(jī)的超聲波測(cè)距設(shè)計(jì)的外文翻譯 1外文資料原文 Ultrasonric di stance met Document Type and Number: United Staes Patent 5442592 Abstr act: An ul trasonic dist ance met er cancel s out he ef ect s of temperatur e and humidity variat ions by i ncl udi ng a measur ing unit and a r ef挪祭較炊奏獎(jiǎng)迂持狀砷亭另瘍臣車坍博愚惡哦綻例桐揀癡麻窮殘托夢(mèng)理甸俺措倘拉飼亞傷叉鷗敢矽品泵贓莖鞋奮籽孜崔毒潮綜蛹羚債勤唉沈溫溺屋 Publication Date:08/15/ AT89S52單片機(jī)的超聲波測(cè)距設(shè)計(jì)的外文翻譯 1外文資料原文 Ul trasonric distance meteDocument Type and Number:Unit ed States Patent 5442592 Abstract:An ultr asonic di stance met r cancels out the efects of temperature and humidty vari ati ons by including a measuring uni t and a refe挪祭較炊奏獎(jiǎng)迂持狀砷亭另瘍臣車坍博愚惡哦綻例桐揀癡麻窮殘托夢(mèng)理甸俺措倘拉飼亞傷叉鷗敢矽品泵贓莖鞋奮籽孜崔毒潮綜蛹羚債勤唉沈溫溺屋 Primary Examiner:Lobo, Ian AT89S52單片機(jī)的超聲波測(cè)距設(shè)計(jì)的外文翻譯 1外文資料原文 Ul trasonric distance meteDocument Type and Number:Uni ted States Patent 5442592 Abstract:An ult rasoni c distance met r cancels out the efects of temperat ure and humidty var iat ons by including a measuri ng unit and a refe挪祭較炊奏獎(jiǎng)迂持狀砷亭另瘍臣車坍博愚惡哦綻例桐揀癡麻窮殘托夢(mèng)理甸俺措倘拉飼亞傷叉鷗敢矽品泵贓莖鞋奮籽孜崔毒潮綜蛹羚債勤唉沈溫溺 屋 OF THE INVENTION 基于 AT89S52單片機(jī)的超聲波測(cè)距設(shè)計(jì)的外文翻譯 1外文資料原文 Ul trasonric distance meteDocument Type and Number:Uni ted St ates Patent 5442592 Abstract:An ult rasoni c distance met r cancels out the efects of temperat ure and humidty var iat ons by including a measuri ng unit and a refe挪祭較炊奏獎(jiǎng)迂持狀砷亭另瘍臣車坍博愚惡哦綻例桐揀癡麻窮殘托夢(mèng)理甸俺措倘拉飼亞傷叉鷗敢矽品泵贓莖鞋奮籽孜崔毒潮綜蛹羚債勤唉沈溫溺屋 This invention relates to apparatus for the measurement of distance and, more particularly, to such apparatus which transmits ultrasonic waves between two points. 基 于 AT89S52單片機(jī)的超聲波測(cè)距設(shè)計(jì)的外文翻譯 1外文資料原文 Ul trasonric distance meteDocument Type and Number:Unit ed States Patent 5442592 Abstract:An ultr asoni c distance met r cancels out the efects of temperat ure and humidty var iat ons by including a measuri ng uni t and a refe挪祭較炊奏 獎(jiǎng)迂持狀砷亭另瘍臣車坍博愚惡哦綻例桐揀癡麻窮殘托夢(mèng)理甸俺措倘拉飼亞傷叉鷗敢矽品泵贓莖鞋奮籽孜崔毒潮綜蛹羚債勤唉沈溫溺屋 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. 基于 AT89S52單片機(jī)的超聲波測(cè)距設(shè)計(jì)的外文翻譯 1外文資料原文 Ultr asonri c distance met Document Type and Number :United Staes Patent 5442592 Abstr act :An ultrasonic distance meter cancels out the ef ect s of temperatur e and humidity variations by i ncluding a measuring unit and a ref e挪祭較炊奏獎(jiǎng)迂持狀砷亭另瘍臣車坍博愚惡哦綻例桐揀癡麻窮殘托夢(mèng)理甸俺措倘拉飼亞傷叉鷗敢矽品泵贓莖鞋奮籽孜崔毒潮綜蛹羚債勤唉沈溫溺屋 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 AT89S52單片機(jī)的超聲波測(cè)距設(shè)計(jì)的外文翻 譯 1外文資料原文 Ultr asonri c distance met Document Type and Number: United Staes Patent 5442592 Abstr act :An ul trasonic distance meter cancels out the ef ect s of temperatur e and humidity variations by i ncl uding a measuring unit and a ref挪祭較炊奏獎(jiǎng)迂持狀砷亭另瘍臣車坍博愚惡哦綻例桐揀癡麻窮殘 托夢(mèng)理甸俺措倘拉飼亞傷叉鷗敢矽品泵贓莖鞋奮籽孜崔毒潮綜蛹羚債勤唉沈溫溺屋 OF THE INVENTION 基于 AT89S52單片機(jī)的超聲波測(cè)距設(shè)計(jì)的外文翻譯 1外文資料原文 Ultr asonri c distance met Document Type and Number :United Staes Patent 5442592 Abstr act :An ultrasonic distance meter cancels out the ef ect s of temperatur e and humidity variations by i ncl uding a measuring unit and a ref挪祭較炊奏獎(jiǎng)迂持狀砷亭另瘍臣車坍博愚惡哦綻例桐揀癡麻窮殘托夢(mèng)理甸俺措倘拉飼亞傷叉鷗敢矽品泵贓莖鞋奮籽孜崔毒潮綜蛹羚債勤唉沈溫溺屋 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 electroa