Applications for C-Scan Ultrasonic Testing

The working principle is non destructive testing using sound.

You transmit a specific known sound.

Depending on properties of the material that it is passing through, the sound will:

• change directions, and or
• reflect, and or
• change speed (frequency)

When you receive the sound, either as reflected signal or with a sensor on the other side, an accurate picture that will show all the temperature and density changes of the material can be read.

See:

http://www.npl.co.uk/materials/cog/cscan.html

Yes it can be used. see

http://www.ndt.net/article/wcndt00/papers/idn201/idn201.htm

I am particcularly confused about interpreting the results of c-scan.

the c-scan result show the scanned image of Brazed contact. the image consists of colours which inturn indicate the so called % of bonding. but I think , bonding is proper only when there is no blow-hole in between. but the c-scan image identifies the position of the blow hole & correspondingly gives the % (i. if it is near the surface % is less & if it is away then % is more), which I think gives wrong picture about bonding.

can u explain that?

the c-scan is a kind of scan method use ultrasonic, which can form a flat picture of the detected object .

you can use it for your brazed material joint. but if you want to get more resolution picture you can use a x-ray apparatus.