Single-Echo Measuring Mode
The Cygnus PLUS + models and the Cygnus DIVE thickness gauge have the option to use them in Single-Echo mode using a twin-crystal probe. Using this measuring technique, any coatings or paint need to be removed before a thickness measurement is taken, otherwise their thickness is included.
How it works
An Ultrasonic Thickness Gauge with a probe uses the time taken for an echo of sound to travel through a material and converts this into a thickness measurement. A pulse of sound is sent into the material from the transmitting side of the ultrasonic probe. The instrument then waits for this to return to the receiving side of the probe.
As the sound from a twin crystal probe travels at a slight angle this creates a ‘V-path’. This lengthens the distance travelled by the ultrasound. The electronics in the gauge compensates for this with ‘V-path correction’.
MSI™ (Measurement Stability Indicator)
Exclusive to Cygnus, this feature helps ensure only stable measurements are displayed in Single-Echo mode. If 16 return echoes are the same over a 2 second period the gauge indicates that the reading is stable and therefore highly likely to be accurate.
Advantages of Single-Echo
Single-Echo offers advantages when there is particularly heavy front and/or back wall corrosion. Ultrasound reverberates inside material being tested. Therefore using just one focused beam, helps to keep this to a minimum. This is advantageous when used on:
- Irregular geometric shapes
- Highly attenuative materials e.g cast
- Plastic pipes, e.g. outfall & dredge pipes
- Applications with extremely heavy back wall pitting or corrosion.