This standard specifies the main performance parameters, technical requirements of each section, calibration and use methods of the standard ultrasonic power source for water in the frequency range of 0.5~10MHz. The standard ultrasonic power source is a stable, single-frequency ultrasonic power source with known output ultrasonic sound power. It consists of an ultrasonic frequency oscillator, an impedance matcher and a transducer. It is mainly used as a transfer standard for ultrasonic sound power measurement to compare and calibrate various ultrasonic sound power measurement devices. GB/T 14368-1993 Acoustic Standard Ultrasonic Power Source GB/T14368-1993 Standard Download Decompression Password: www.bzxz.net
This standard specifies the main performance parameters, technical requirements of each section, calibration and use methods of the standard ultrasonic power source for water in the frequency range of 0.5~10MHz. The standard ultrasonic power source is a stable, single-frequency ultrasonic power source with known output ultrasonic sound power. It consists of an ultrasonic frequency oscillator, an impedance matcher and a transducer. It is mainly used as a transfer standard for ultrasonic sound power measurement to compare and calibrate various ultrasonic sound power measurement devices.

National Standard of the People's Republic of China
Acoustic Standard Ultrasonic Power Source
Aenustics-Sandard Ultraxnnic Power Sourc1Subject Content and Scope of Application
GB/T 1436893
This standard specifies the main performance parameters of the standard ultrasonic power source for use in water in the frequency range of 0.5 to 10MHz, the technical requirements of each division, and the calibration and use methods. The standard ultrasonic power source is a stable, single-frequency ultrasonic power source with known output ultrasonic sound power. It consists of an ultrasonic frequency oscillator, an impedance matcher and a transducer. It is mainly used as a transfer standard for ultrasonic sound power measurement to compare and calibrate various ultrasonic sound power measurement devices.
2 Reference standards
GB3947 Acoustics Terminology
GB 3102.7 Acoustics Units
GB7966 Acoustics Measurement of ultrasonic sound power in the frequency range of 0.5 to 10 MHz 3 Main performance parameters
The main performance parameters specified in this standard should be measured in degassed distilled water at a temperature of 23 ± 3 °C, under conditions of strong mechanical vibration and no cavitation.
3.1 Working frequency and its stability
The working frequency range of the standard ultrasonic power source is 0.5~10 MHz. This standard recommends the nominal frequencies of 0.5, 1.3, 5 and 10 MHz, and the frequency stability should be better than 2×10-3/d.
3.2 Rated output ultrasonic sound power
The continuous wave output ultrasonic sound power of the standard ultrasonic power source is divided into: milliwatt level: 1~500mWbzxZ.net
Watt level. 0. 5~20 W
3.3 The accuracy of the output ultrasonic sound power should not be greater than 5%. 3.4 Distortion
The distortion of the voltage signal added to the input end of the impedance matcher should not be greater than 2%. 3.5 Stability
Calibrate at least once a year, and the change of its output ultrasonic sound power should be within the calibration uncertainty + 5%. 4 Technical requirements of each section
4.1 Transducer
4.1.1 The transducer is a circular plane piston type. Its transducer element should be made of single crystal piezoelectric materials such as quartz or lithium saw oxide with good stability and ductility, with a diameter of 1~5cm.
4.1.2 The transducer shall be watertight under normal pressure, and the insulation resistance measured between the two poles of the transducer shall be greater than 100M0 (measured with 1000V megohmmeter). Approved by the Technical Supervision Bureau on March 17, 1993 and implemented on December 1, 1993
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4.2 Ultrasonic frequency oscillator
GB/T14368-93
4.2.1 The working frequency range is 0.510 MHz, and the frequency stability shall be better than 2×10~3/d. 4.2.2 The output power shall not be less than 5W for millisecond ultrasonic power source and not less than 100W for watt ultrasonic power source. 4.2.3 The output impedance shall be 50 0.
4.2.4 The distortion of the output signal is less than 2%. Note: The ultrasonic oscillator can also be composed of an ultrasonic signal generator and a power amplifier. 4.3 Impedance matcher
4.3.1 The input impedance should be 50 0, and the output impedance should be compatible with the impedance of the matched transducer. 4.3.2 The rated electric power should be greater than 5W for milliwatt ultrasonic power sources and greater than 100W for watts. 4.3.3 The impedance matcher can be equipped with a detection winding proportional to the input voltage to indicate the output ultrasonic sound power. 5 Calibration method
5.1 The calibration of the standard ultrasonic power source should be carried out according to the first-level calibration method specified in GB7966. 5.2 For each standard ultrasonic power source of a specified frequency, a calibration curve of the output ultrasonic sound power versus the square of the voltage at the input end of the impedance matcher or its detection winding end should be given, as shown in Figure 1. Pw
Figure 1 Output ultrasonic sound power versus the voltage at the input end of the impedance matcher or its detection winding end Square calibration curve 6 Usage method
6.1 When using, measure the voltage applied to the input end of the impedance matcher or its detection system end, and check the output ultrasonic sound power of the standard ultrasonic power source from the curve in Figure 1.
6.2 The accuracy of the frequency meter with a constant rate should be better than 10:*. 6.3 The accuracy of the voltmeter for measuring voltage should be better than 1%, and the input impedance should be greater than 1M2.
GB/T14368-93
Additional instructions:
This standard is proposed by the National Acoustic Standardization Technical Committee. This standard is under the responsibility of the 721 Factory of China Shipbuilding Industry Corporation, and the China Institute of Metrology and Guangdong Institute of Metrology are the main contributors to the compilation of this standard.
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