Dual-crystal line array for corrosion detectionDLAProbe

Dual Crystal Linear Array (DLA) probes for corrosion detection offer more advantageous features compared to conventional ultrasonic dual crystal probes. This phased array solution provides a wider beam coverage, faster scanning speeds, and C-scan imaging with higher data point density, thereby enhancing detection efficiency. The new probe's one-transmit-one-receive technology, compared to standard phased array pulse echo, offers improved near-surface resolution and pitting detection capabilities in corrosion measurement applications, increasing the detection rate of critical wall thinning situations.

Thanks to its new features, such as built-in irrigation and replaceable delay blocks that better adhere to pipe arcs, the Double Crystal Linear Array (DLA) corrosion probe is now suitable for automatic detection.

Advantages and Characteristics of the Probe

• Defects detectable below the surface by 1 millimeter

• High-value-for-money replaceable delay blocks

• Built-in irrigation

• High-Temperature Option, capable of scanning hot surfaces

• Beam coverage width up to 30 millimeters

• A versatile and rapidly adjustable system for inspecting materials with diameters ranging from 4 inches to flat surfaces.

• Durable and robust hard alloy abrasion-resistant plate for protecting wedges

• Carbon steel materials typically have a detection depth range of 1mm to 80mm.

• OmniScan configuration files (MX, MX2, and SX) on the USB flash drive

OmniScan Software Features

• Side view, end view, and top view imaging (B scan, D scan, and C scan)

• Complete high-resolution A scan storage

• Two configurable probe gates

• Offline analysis on the OmniScan flaw detector or a computer using the OmniPC software.

New features, new potential

The combination of a Double Crystal Linear Array (DLA) Corrosion Probe and an OmniScan SX flaw detector offers an economical inspection option. This solution is easy to set up and operate: load the provided setup file, check the calibration, and then inspect and record data. No pulse generator/receiver (PR) equipment is required.

Whether manually scanning an area with an encoder or achieving high-speed, full-volume imaging with the MapROVER electric scanner, the Double Crystal Linear Array (DLA) corrosion probe can quickly and easily perform C-scan imaging operations on smooth surfaces. The innovative probe stabilization system, combined with replaceable curved surface delay blocks and irrigation features, delivers superior acoustic beam propagation on pipe surfaces as small as 4 inches in diameter. We also offer a high-temperature version of the DLA corrosion probe, capable of detecting surfaces up to 150°C.

DLA corrosion probe used in automatic detection with the MapROVER scanner.

Dual Crystal Array Single Transmitter and Single Receiver Technology

Similar to the dual crystal UT probe, the dual crystal linear array probe consists of a set of transmitting crystals and a set of receiving crystals, which are respectively mounted on two parts of a delay block cut at a certain angle. This configuration generates focused sound beams below the surface of the workpiece being tested, significantly reducing the amplitude of surface reflections. Additionally, it enhances near-surface resolution, enabling a higher detection rate for critical defects such as pitting, creep damage, and HIC (hydrogen-induced cracking).

One-way transmission and reception Pulse echo

Compared to phased-array pulse echo, one-transmit-one-receive technology generates much smaller interface echoes, offering improved near-surface resolution.

B-scan image of corrosion defects on carbon steel pipes