GB/T 18694-2002 English PDF

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GB/T 18694-2002: Non-destructive testing -- Ultrasonic inspection -- Characterization of search unit and sound field
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 18694-2002	519	Add to Cart	4 days	Non-destructive testing -- Ultrasonic inspection -- Characterization of search unit and sound field	Valid

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Basic data

Standard ID: GB/T 18694-2002 (GB/T18694-2002)
Description (Translated English): Non-destructivetesting. Ultrasonic inspection. Characterization of search unit and sound field
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: J04
Classification of International Standard: 19.100
Word Count Estimation: 20,278
Date of Issue: 2002-03-10
Date of Implementation: 2002-08-01
Quoted Standard: JB/T 4730-1994; JB/T 8428-1996; JB/T 10063-1999
Adopted Standard: ISO 10375-1997 (E); MOD
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People Republic of China
Summary: This standard specifies: ultrasound probe some performance and probe the sound field testing methods. This standard mesh is to establish uniform Test methods, to form a basis for assessment, pairs in different laboratories and at different times the measurement results to be evaluated. The standard does not specify the probe acceptance criteria, However, to adopt this standard the parties specified acceptance criteria laid the technical foundation. This standard applies to: a nominal frequency of 0. 5 ~ 15MHz-straight probe and oblique probe, but does not include wave probe. This standard specifies: Probe sound field technical parameters and in liquids methods of measurement. This standard does not address the contact detection acoustic measurement problems. This standard specifies: ultrasound probe is used to evaluate performance measurement procedures and to an electrical pulse excitation field and laboratory use technical parameters of the sound field probes Test methods. This standard is discussed Performance parameters are the following: a variety of shapes probe in free field high and low frequencies, center frequency, wavelength, Bandwidth, time domain and frequency domain response, near field length, half spread angle and echo amplitude measurement, sound beam cross country sound pressure distribution, impedance and relative sensitivity. Given the level probe and probe focusing performance requirements forms of expression. In order to give the probe baseline information and inspection may exist performance degradation, also independent of the ultrasonic instrument were measured electrical properties of the probe. Electrical impedance and sensitivity is measured at each test probe specified frequency -. Electrical impedance is the probe enter the complex impedance, while the probe is the probe sensitivity electro-acoustic conversion efficiency a measure. In this two test procedures are described in 4. 6 and 4. 7.

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