Direct Shear-Wave Probe Holder for ACS DPC Transducers (DS-18xx Series)
The DS-18xx Direct Shear-Wave Probe Holder is a precision alignment and coupling accessory designed for use with ACS Dry-Point-Contact (DPC) shear transducers in direct transmission mode. It is fully compatible with the A1220 MONOLITH UPVT – Ultimate Ultrasonic Pulse Velocity Tester.
In the direct method, the transmitting and receiving shear-wave probes are mounted on opposite sides of the inspected object. The DS-18xx holder ensures accurate opposite-side alignment, stable mechanical coupling, and a fixed pitch distance between the two transducers. These mechanical conditions are essential for high-quality shear-wave propagation through concrete, stone, and masonry, enabling reliable through-transmission ultrasonic velocity measurements.
The DS-18xx series supports several standard pitch configurations optimised for all ACS shear-wave DPC transducers. This allows high-sensitivity S-wave velocity assessment, particularly useful for detecting cracks, delamination, stiffness gradients and anisotropy in structural materials.
Direct shear-wave holder for ACS DPC probes, ensuring rigid opposite-side alignment and stable coupling for S-wave through-transmission measurements with the A1220 MONOLITH UPVT.
The DS-18xx holder is used with the A1220 MONOLITH UPVT – Ultimate Ultrasonic Pulse Velocity Tester to perform shear-wave measurements in direct (through-transmission) mode. The transmitting and receiving ACS DPC shear probes are placed on opposite sides of the material, enabling high-sensitivity shear-wave velocity measurements.
Accurate direct S-wave transmission requires:
• precise opposite-side alignment of the two shear probes
• fixed and repeatable probe-to-probe pitch
• constant coupling force on both contact surfaces
The DS-18xx holder ensures these conditions through a rigid dual-side frame and a spring-stabilised coupling mechanism.
Compatible ACS shear-wave DPC transducers:
• S1902 — 120 mm pitch
• S1801 — 80 mm pitch
• S1802 — 80 mm pitch
• S1806 — 40 mm pitch
• S1807 — 25 mm pitch
• S1808 — 20 mm pitch
Typical applications with the A1220 MONOLITH UPVT:
• direct shear-wave velocity measurement
• detection of cracks, voids, delamination, and anisotropy
• evaluation of material integrity and stiffness gradients
• structural diagnostics of concrete, stone, and masonry
| Parameter | Value |
| Recomendet pitch sizes | 20 mm, 25 mm, 40 mm, 80 mm, 120 mm |
| Compatible DPC transducers | S1902, S1801, S1802, S1806, S1807, S1808 |
| Wave type | Shear (S-wave) |
| Transmission mode | Direct (through-transmission) |
| Compatible system | A1220 MONOLITH UPVT – Ultimate Ultrasonic Pulse Velocity Tester |
| Coupling method | Dry-Point-Contact (DPC) |
| Supported materials | Concrete, stone, masonry, composites |
| Pitch accuracy | ±2 mm |
| Frame construction | Rigid dual-probe opposite-side alignment frame |
• DS-18xx Direct Shear-Wave Holder Frame
• Dual opposite-side mounting brackets
• Spring-loaded coupling mechanism for both probes
• Alignment reference guides
• Protective transport sleeve / carrying case
About ACS Group
Acoustic Control Systems – ACS Group – Established in 1991 – is the International Provider of Innovative Ultrasonic Testing Equipment and Professional Inspection and Engineering Services.
The definitive distinction of ACS products is their high technological level and ease of use, matching the requirements of professional users in a wide range of practical applications. The main goal of our instruments is to reach top technical characteristics by affordable costs in combination with the perfect warranty service and methodical support of our customers.
More than 30 years of in-field testing experience in combination with scientific signal and image processing techniques and modern manufacturing processes by using the best components available on the market allow ACS to be always technologically one step ahead of competitors.
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