ACOUSTICS & VIBRATION LABORATORY

ACOUSTICS & VIBRATION LABORATORY
OBJECTIVES AND TASKS
The main objective of Acoustics Laboratory is realization, maintenance and dissemination of standards of sound pressure in air, rectilinear acceleration, ultrasonic power and underwater acoustics. The degree of equivalence of realized national standards is proved through participation in international comparisons. Laboratory provides a wide range of calibration, measurements and test services in all three filed of activities. Investigation and development on non-traditional methods for acoustics, vibration and ultrasonics measurements is within the activity of Acoustics Laboratory.

STUDY AREAS
Acoustics Laboratory is carrying out its activities on the following subjects
Realization and development of sound pressure unit standard
Realization and development of rectilinear acceleration unit standard
Realization and development of ultrasonic power unit standard
Calibration and characterization of sound sources
Sound calibrators
Pistonphones
Calibration and characterization of vibration exciters
Calibration and testing of audiological devices
Audiometers
Artificial Ears
Artificial Mastoids
Bone Vibrators
Calibration of sound measuring equipment
Sound Level Meters
Sound Analyzers
Noise Dose Meters
Calibration of vibration measuring equipment
Environmental noise measurements
Determination of acoustical parameters of materials
Vibration measurement and condition monitoring
Characterization of ultrasonic flaw detector
Underwater acoustical measurements
Measurement of absolute gravity of acceleration


REALIZATION OF NATIONAL STANDARDS IN THE FIELD ACOUSTICS, VIBRATION AND ULTRASONICS
The national standard of sound pressure in air has been realized through calibration of condenser microphones by closed coupler reciprocity technique in accordance with IEC 61094-2 standard in frequency range of 63-25000 Hz. The primary standard of rectilinear acceleration has been realized through calibration of piezoelectric accelerometers by laser interferometric technique according to the ISO 16063-11 standard in the frequency range of 31,5-10000 Hz. The realization of ultrasonic power standard has been realized through radiation force balance technique in accordance with IEC 61161 standard.

FUTURE PLANS
Major activities of Acoustics Laboratory will be focused on research and development in the following areas:
Realization and maintenance of sound pressure unit in free field
Realization and maintenance of angular acceleration unit standard
Establishment of shock calibration facilities
Development of nontraditional sound and vibration transducers
Characterization of seismic transducers
Modal analysis
Free field calibration of hydrophones
Calibration of hydrophones by time delay spectroscopy
Characterization of ultrasonic cleaning bathes
Determination of ultrasonic power and pressure by optical and thermal methods

CALIBRATION AND MEASUREMENT SYSTEMS
The major calibration and measurement systems used in laboratory are:
Reciprocity calibration apparatus
Laser interferometer for calibration of vibration pick-ups
Radiation Force balance for ultrasonic power
System for comparison calibrations of acoustical and vibration transducers
Sound level meter calibration system
System for calibration and characterization of audiological equipment
Absolute measurement of acceleration of gravity system
System for determination of acoustical parameters of materials

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