A low-frequency output device for a modulation radiometer

1973 ◽  
Vol 16 (5) ◽  
pp. 545-547
Author(s):  
V. A. Prozorov
Keyword(s):  
Low Frequency ◽  
Modulation Radiometer ◽  
Output Device ◽  
Frequency Output

scholarly journals PENGARUH FREKUENSI GELOMBANG TERHADAP RESOLUSI DAN DELINEASI PERLAPISAN SEDIMEN BAWAH PERMUKAAN DARI DUA INSTRUMEN AKUSTIK YANG BERBEDA DI SUNGAI SAGULIN

2016 ◽  
Vol 2 (2) ◽  
Author(s):  
Subarsyah Subarsyah ◽  
Muh. Yusuf
Keyword(s):  
High Frequency ◽  
Low Frequency ◽  
Diffraction Multiple ◽  
Acoustic Instruments ◽  
Frequency Output

Implementasi pengukuran kedalaman dasar Sungai Saguling dilakukan dengan menggunakan instrumen akustik dengan keluaran frekuensi yang berbeda. Yang pertama dengan peralatan echosounder Raytheon DE-719 CM berfrekuensi 200 KHz, sedangkan yang kedua dengan menggunakan peralatan StrataboxTM berfrekuensi 10 KHz. Penggunaan kedua instrumen akustik dengan keluaran frekuensi yang berbeda tersebut masing-masing memberikan informasi tersendiri. Peralatan dengan frekuensi tinggi 200 KHz memberikan resolusi dan presisi yang tinggi dalam penentuan kedalaman dasar sungai dengan konsekwensi penetrasi menjadi dangkal, sedangkan peralatan StrataboxTM dengan berfrekuensi 10 KHz memberikan informasi kedalaman, ketebalan sedimen dengan resolusi yang berkurang. Hal ini dipengaruhi faktor lebar beam, seperti munculnya efek difraksi, multiple, dan gelombang yang tidak diinginkan. Bathymetric measurement of Saguling River was using different frequency output of acoustic implemented using acoustic instruments. The first was echosounder Raytheon DE-719 CM with frequency output of 200 KHz, and the second was Stratabox TM with frequency output of 10 KHz. This two acoustic instruments each gives different information. Bathymetric measurement of river with high frequency instrument (200 KHz) improve the resolution and precision of data, but the consequence that penetration become shallow, while measurement using low frequency output (10 KHz) make the penetration become high, but less in resolution, it's influence by width of beam factor, such as the appearance of diffraction, multiple, and others unwanted signal.

A New Type of Electroacoustic Transducer Used for Downhole Acoustic Telemetry System

2013 ◽  
Vol 336-338 ◽  
pp. 286-289
Author(s):  
Xuan Chao Liu ◽  
Yan Xia He ◽  
Guo Hong Li
Keyword(s):  
High Power ◽  
Acoustic Telemetry ◽  
Petroleum Industry ◽  
Low Frequency ◽  
Telemetry System ◽  
Magnetostrictive Materials ◽  
Electroacoustic Transducer ◽  
Giant Magnetostrictive Materials ◽  
Frequency Output ◽  
New Type

The high power and low frequency electroacoustic transducer plays a very important role in the underground acoustic telemetry system used for petroleum industry. How to realize electroacoustic conversion technology with the giant magnetostrictive materials was studied in this paper. The principles and methods of how to design it were proposed and the experimental verification was achieved. Results show that the electroacoustic transducer based on giant magnetostrictive materials features high-power and low-frequency output, high conversion efficiency, high temperature resistance, and excellent performance. It can completely meet the needs of the downhole acoustic telemetry system.

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