Ding Xia shaw * teclab.cn TECLAB China

Summary:Various voltage or power amplifiers are commonly used in ultrasonic non-destructive testing research to amplify the weak signal waveform generated by the function generator and excite the ultrasonic transducer to achieve detection. This article uses an arbitrary waveform high-voltage amplifier developed for the field of ultrasonic non-destructive testing for basic performance testing and verifies it through practical testing on various commonly used research cases.

keyword:Arbitrary waveform amplifier, Gaussian signal, Chirp signal, high voltage amplifier, power amplifier

Background:Common high-voltage amplifiers in the field of domestic ultrasonic non-destructive testing research include products from companies such as AR in the United States, E&I in the United Kingdom, RITEC in the United States, and Antai Technology. Among them, the GA2500A from RITEC in the United States is favored by scientific research users due to its power amplifier, which can amplify voltage peaks up to 1000Vpp and bandwidth ranging from KHz to MHz. However, due to its high price, it is more commonly used to select products from Antai Technology Company. The selling price is relatively low. The TECLAB UT-AWG arbitrary waveform high-voltage amplifier used in this article can provide 300 Vpp peak to peak output and has a bandwidth of 0-5 MHz, and is relatively inexpensive, which is sufficient to meet common ultrasonic testing application scenarios.

Basic performance testing

Test results:

UT-AWG supports 300 Vpp amplification output within the bandwidth range of 0-2MHz

Support amplification and output of any waveform signal

Achieved 300 Vpp -6dB amplified output in the 5 MHz high-frequency band, i.e. 150 Vpp

Application of Air Coupled Ultrasonic Lamb Wave Testing for Titanium Alloy Thin Plates

Main experimental setup:

Function generator

TECLAB UT-AWG arbitrary waveform high voltage amplifier

TECLAB AIR400-R50 point focused air coupled ultrasonic transducer pair

TECLAB Pre AMP 20/40/60 dB preamplifier

Oscilloscope

2mm thick titanium alloy sheet (with through-hole defect)

Experimental conclusion:

This device can achieve blue wave detection of through-hole defects in titanium alloy thin plates

Application of Air Coupled Echo Resonance Method in Thickness Measurement

Excitation frequency: 105 KHz corresponding to wavelength: 56 mm

Using probe: 100 KHz non focusing

Lift off: 10 cm

Excitation signal: 5 cycles sine wave (windowless, non Gaussian, non CHIRP)

Excitation voltage: ± 150 V

Resonance peak calculation thickness: 14.145 mm

Actual thickness: 14.00 mm

Application of low-frequency dry coupled ultrasonic testing for concrete

Main experimental setup:

Function generator

TECLAB UT-AWG arbitrary waveform high voltage amplifier

TECLAB 50KHz dry coupled ultrasonic transverse wave transducer and 100KHz dry coupled ultrasonic longitudinal wave transducer, one pair each

TECLAB Pre AMP 20/40/60 dB preamplifier

Oscilloscope

Concrete test block

Experimental conclusion:

This device can measure the sound velocity of concrete, analyze defects, and evaluate mechanical properties

Application of Ultrasonic Surface Wave Testing for Carbon Fiber Board

Main experimental setup:

Function generator

TECLAB UT-AWG arbitrary waveform high voltage amplifier

TECLAB 2 MHz Variable Angle Ultrasonic Transducer

TECLAB Pre AMP 20/40/60 dB preamplifier

Oscilloscope

Carbon fiber board specimen

Experimental conclusion:

This device can be used for surface wave detection of carbon fiber composite material plates

Application of dry coupled ultrasonic probe surface wave detection for carbon fiber composite board

Main experimental setup:

Function generator

TECLAB UT-AWG arbitrary waveform high voltage amplifier

TECLAB 100 KHz dry coupled ultrasonic transducer pair

TECLAB Pre AMP 20/40/60 dB preamplifier

Oscilloscope

Carbon fiber board specimen (pre fabricated debonding defect)

Experimental conclusion:

This device can be used for surface wave detection of carbon fiber composite material plates