查詢結果分析
相關文獻
- 超音波相位差式音速量測法
- The Effect of Changes in the Internal Structure of a Schooling Fish on the Estimation Efficiency by Acoustic Methods
- The Use of Stationary Hydroacoustic Transducer to Study Diel and Seasonal Influences on the Distribution of Fish School in Water Adjacent to the Cooling Water Intake of Nuclear Power Plant III
- 超音波距離量測系統之設計
- Transcatheter Closure of Atrial Septal Defect Guided by On-Line Transesophageal Echocardiography
- Pelvic Abscess after Ultrasound-Guided Aspiration of Endometrioma: A Case Report
- Color Doppler Ultrasound Velocimetry of Internal Carotid Arteries in Normal Pregnancies
- Intraluminal Mucin Pool in Mucinous Gastric Adenocarcinoma: A Case Report
- Morbidity with Contemporary Transrectal Biopsy of the Prostate
- 超音波結石刮及改良式超音波結石刮在牙周病治療上的應用
頁籤選單縮合
題 名 | 超音波相位差式音速量測法=A Ultrasonic Phase Difference Method for Sound Velocity Measurements |
---|---|
作 者 | 潘健清; 李彥杰; | 書刊名 | 義守大學學報 |
卷 期 | 4 1997.08[民86.08] |
頁 次 | 頁139-150 |
分類號 | 334.6 |
關鍵詞 | 音速量測; 超音波; 相位差法; Sound velocity; Ultrasonic; Phase measurements; |
語 文 | 中文(Chinese) |
中文摘要 | 在超音波量測的各項應用中,聲音的傳播速度是一項重要的基本參考數據。但在 空氣中超音波量測的應用上, 大多均將音波在室溫空氣中傳播的速度視為一定值 (348~360m/s),或以查表法選擇一相近似環境條件之音速值來加以應用,但是我們始終不了 解所選用的音速值在實際測量時的誤差範圍是多少﹖相對也影響到量測結果的可靠度。本文 將介紹一種精巧的音速量測技術。 這個方法使用一對價格低廉的 40KHz 超音波換能器為主 要感測元件,這兩個換能器以面對面方式擺設,一組單晶微電腦讀取並記錄換能器間發射波 與接收波的相位差變化,藉由這些資料我們就能求出精確的音速。此一系統的優點為:高精 確度、低成本且易於建置。 |
英文摘要 | The sound velocity is a very important parameter for many ultrasonic based measurements. Most of the airborne type ultrasonic measurement systems are assume the sound velocity to be a constant(348~360m/s) when operate. Some of them can measure the room temperature and use a look up table to estimate the sound velocity. However the real velocity value at the measurement enviromnent is still unknown. This will influence the measurement result of the ultrasonic system. In this article an ingenious method to measure sound velocity in air has been developed. A pair of low cost 40-KHz ultrasonic transducers is used to transmit and receive ultrasonic signals face by face. A single-chip microcomputer-based phase detector was designed to record the phase difference between transmitting and received ultrasonic signals. After a calculation procedure, the sound velocity can be given from the phase difference value. The main advantages of this system are:high precision, low cost, and easy to install. |
本系統中英文摘要資訊取自各篇刊載內容。