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工業(yè)通用技術(shù)及設(shè)備

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time gain

    Influence on the Time Gain and the Time correlation from the Fluctuant Phase of the Acoustic Signal

    相位起伏對(duì)水聲信號(hào)時(shí)間增益及時(shí)間相關(guān)性能的影響

    One set of circuits with constant parameter Q is used to realize the echo receiving of different frequencies. Instead of the traditional time gain controlling technique, reverberation gain controlling technique is applied to realize large dynamic range condensing and reverberation background normalization.

    系統(tǒng)采用一套硬件電路實(shí)現(xiàn)了恒 Q值的多個(gè)回波頻率的接收 ,并采用混響增益控制代替?zhèn)鹘y(tǒng)的時(shí)間增益控制 ,實(shí)現(xiàn)了對(duì)水下信號(hào)的大動(dòng)態(tài)范圍壓縮和海洋噪聲背景的歸一化處理。

短句來(lái)源

    Basic principles of the medical ultrasonic diagnostic instruments and the time gain compensation circuit are briefly introduced, and a new design of TGC circuits using new electronic components is proposed in this paper.

    文章簡(jiǎn)要介紹了超聲診斷儀器的深度時(shí)間增益補(bǔ)償電路(TGC)的基本原理,即用一定的電壓曲線來(lái)控制放大器的增益,使不同深度下的超聲回波獲得不同的放大倍數(shù)。 文中還提出了一種采用新型電子元器件的數(shù)字控制解決方案,能有效減小送入A/D轉(zhuǎn)換器的信號(hào)的動(dòng)態(tài)范圍。

短句來(lái)源

    Design of time gain compensation circuit for ultrasonic signals

    超聲衰減增益補(bǔ)償電路的設(shè)計(jì)

短句來(lái)源

    When passive synthetic aperture technique is applied to linear array, we can achieve a longer dummy array which is several or several decade times of conventional real aperture linear array. By exchanging time gain with spatial gain, passive synthetic aperture processing makes use of delay compensation to obtain higher dynamic spatial gain, and extremely improve detecting performance of weak signal.

    被動(dòng)合成孔徑技術(shù)應(yīng)用于線列陣可以獲得幾倍到幾十倍于實(shí)際物理聲陣的合成虛擬孔徑陣，它基于利用時(shí)間處理增益轉(zhuǎn)換為空間處理增益思想，通過(guò)時(shí)間補(bǔ)償，獲得高動(dòng)態(tài)空間增益，提高了對(duì)微弱信號(hào)檢測(cè)性能。

短句來(lái)源

    We handle the analysis of variance and the regression analysis to deal with the data of the experimentation about the drying time, gain the best scheme and the best model of the regression equation for the Vacuum Freeze-drying process of the cucumber. We check out the best scheme and the best result of the regression equation by the experimentation.

    運(yùn)用極差分析和回歸分析對(duì)干燥時(shí)間的實(shí)驗(yàn)結(jié)果進(jìn)行了數(shù)據(jù)處理，，得到黃瓜真空冷凍干燥過(guò)程的最優(yōu)回歸方程和最優(yōu)方案，并通過(guò)實(shí)驗(yàn)進(jìn)行了驗(yàn)證。

短句來(lái)源

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  time gain

It is shown that the analysis-time gain can be obtained for the invariable characteristics of the detection efficiency compared with the well-known algorithms.

An Analog Integrated Circuit for Continuous-Time Gain and Offset Calibration of Sensor Arrays

Characteristic viscosity introduction appears to present a useful option compared to rheological modelisation based on experimental data, with computer time gain and relevant results for quantitative and qualitative WSS determination.

Robotic Manipulators State Observation Via One-Time Gain Switching

In contrast to this, little information is gained on the hyperfine structure of the M?ss-bauer spectra, yet the time gain by scanning the outermost crystalline phase Zeeman line intensity is substantial.

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In this paper, a method named as the Difference Ratio Correction (DRC) Method is proposed to estimate the acoustical attenuation in vivo using the video output of commercial B-scanners. This method eliminated the affects of such factors as gains, the Time-Gain-Compensatin of the scanner, the diffraction and scattering of the beam of the probe, etc. Another advantage of the method is that it needn't modify the construction of the scanner, hence, it can be applied to clinical situations easily....

In this paper, a method named as the Difference Ratio Correction (DRC) Method is proposed to estimate the acoustical attenuation in vivo using the video output of commercial B-scanners. This method eliminated the affects of such factors as gains, the Time-Gain-Compensatin of the scanner, the diffraction and scattering of the beam of the probe, etc. Another advantage of the method is that it needn't modify the construction of the scanner, hence, it can be applied to clinical situations easily. In this paper, the formula used to calculate the attenuation slope of ultrasonic tissue mimicking phantoms measured by the DRC method is reported and compared with those from the transmission method. Experimental results support the effectiveness of the method.

本文介紹了一種利用B超視頻輸出信號(hào)進(jìn)行體內(nèi)組織聲衰減估計(jì)的方法——差比校正法.該法利用已在臨床上普及應(yīng)用的B超,消除了B超的增益,時(shí)間增益補(bǔ)償、聲束的擴(kuò)散和散射等因素的影響,并且不需對(duì)現(xiàn)有B超做任何改動(dòng),具有較廣泛的實(shí)用性.本文還從理論上導(dǎo)出了計(jì)算體內(nèi)組織聲衰減系數(shù)的計(jì)算公式,給出了差比校正法對(duì)超聲仿真模型的聲衰減系數(shù)的測(cè)量結(jié)果,并與傳輸法所得結(jié)果進(jìn)行了比較.實(shí)驗(yàn)結(jié)果證明了差比校正法的有效性.

In order to receive the echo of the underwater target, a method to design a kind of high precision, wide dynamic range, general receiver is presented in this paper. One set of circuits with constant parameter Q is used to realize the echo receiving of different frequencies. Instead of the traditional time gain controlling technique, reverberation gain controlling technique is applied to realize large dynamic range condensing and reverberation background normalization. Through sea test, it has been...

In order to receive the echo of the underwater target, a method to design a kind of high precision, wide dynamic range, general receiver is presented in this paper. One set of circuits with constant parameter Q is used to realize the echo receiving of different frequencies. Instead of the traditional time gain controlling technique, reverberation gain controlling technique is applied to realize large dynamic range condensing and reverberation background normalization. Through sea test, it has been proved that the system has high precision, good adaptability, wide dynamic range and stable performance. The principle, the hardware construction and its performance are discussed in this paper.

為了接收水下目標(biāo)反射回波 ,研究并設(shè)計(jì)了一種高精度、大動(dòng)態(tài)范圍的通用水聲接收機(jī)。系統(tǒng)采用一套硬件電路實(shí)現(xiàn)了恒 Q值的多個(gè)回波頻率的接收 ,并采用混響增益控制代替?zhèn)鹘y(tǒng)的時(shí)間增益控制 ,實(shí)現(xiàn)了對(duì)水下信號(hào)的大動(dòng)態(tài)范圍壓縮和海洋噪聲背景的歸一化處理。海上試驗(yàn)證明 ,系統(tǒng)具有精度高、適應(yīng)性強(qiáng)、動(dòng)態(tài)范圍大、電路性能穩(wěn)定、經(jīng)濟(jì)實(shí)用等特點(diǎn)。介紹了該系統(tǒng)的工作原理、硬件結(jié)構(gòu)及系統(tǒng)性能等。

Ultrasonic energy is absorbed by the penetrated medium and is attenuated with depth. Therefore, it needs compensation so as to limit the dynamic range of the signal sent to the A/D converter. Basic principles of the medical ultrasonic diagnostic instruments and the time gain compensation circuit are briefly introduced, and a new design of TGC circuits using new electronic components is proposed in this paper. AD604 is an ultra-low noise, very accurate, and linear-in-dB variable gain amplifier optimized...

Ultrasonic energy is absorbed by the penetrated medium and is attenuated with depth. Therefore, it needs compensation so as to limit the dynamic range of the signal sent to the A/D converter. Basic principles of the medical ultrasonic diagnostic instruments and the time gain compensation circuit are briefly introduced, and a new design of TGC circuits using new electronic components is proposed in this paper. AD604 is an ultra-low noise, very accurate, and linear-in-dB variable gain amplifier optimized for time-based variable gain control in ultrasound applications. The described design method is simple and its digital control is stable.

醫(yī)用超聲儀器發(fā)出的超聲波在人體內(nèi)的傳播過(guò)程中,能量被人體組織吸收,隨著探測(cè)深度的增加,超聲波能量逐漸衰減,回波信號(hào)的動(dòng)態(tài)范圍很大,因此要進(jìn)行聲程補(bǔ)償。文章簡(jiǎn)要介紹了超聲診斷儀器的深度時(shí)間增益補(bǔ)償電路(TGC)的基本原理,即用一定的電壓曲線來(lái)控制放大器的增益,使不同深度下的超聲回波獲得不同的放大倍數(shù)。文中還提出了一種采用新型電子元器件的數(shù)字控制解決方案,能有效減小送入A/D轉(zhuǎn)換器的信號(hào)的動(dòng)態(tài)范圍。該方案采用新型的高精度、低噪聲、增益可變放大器AD604,電路簡(jiǎn)單,控制信號(hào)穩(wěn)定可靠,能準(zhǔn)確地補(bǔ)償超聲波在人體內(nèi)的衰減,并為控制系統(tǒng)實(shí)現(xiàn)高速數(shù)字化提供了一個(gè)方法。

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  本文關(guān)鍵詞：工業(yè)通用技術(shù)及設(shè)備，由筆耕文化傳播整理發(fā)布。