Indirect Shear-Wave Probe Holder for ACS DPC Transducers (IS-18xx Series)
The IS-18xx Indirect Shear-Wave Probe Holder is a precision mechanical accessory for single-sided ultrasonic S-wave measurements using ACS Dry-Point-Contact (DPC) transducers. It is designed specifically for use with the A1220 MONOLITH UPVT – Ultimate Ultrasonic Pulse Velocity Tester.
In indirect (surface) mode, both DPC shear transducers are placed on the same surface of the material. The IS-18xx holder ensures correct angular orientation of the shear-wave probes, a stable and repeatable pitch distance, and reliable coupling pressure. These factors are essential for accurate shear-wave velocity measurements on concrete, stone, masonry, and composite structures.
The IS-18xx series supports several standard pitch configurations corresponding to all ACS shear-wave DPC transducers supported by the A1220 MONOLITH UPVT. This enables accurate surface-based S-wave velocity assessment in applications where direct transmission is impractical or where only one surface is accessible.
Indirect shear-wave holder for ACS DPC probes, ensuring fixed pitch, stable coupling pressure and precise probe alignment for surface-based S-wave UPV measurements with the A1220 MONOLITH UPVT.
The IS-18xx holder is used with the A1220 MONOLITH UPVT – Ultimate Ultrasonic Pulse Velocity Tester to perform shear-wave measurements in indirect (surface) transmission mode. Both DPC shear transducers are positioned on the same surface of the test object, enabling S-wave UPV evaluation when opposite-side access is limited or impossible.
Accurate indirect S-wave measurements require:
• correct orientation of the shear-wave vibration direction
• constant lateral coupling pressure
• a fixed and reproducible pitch distance
The IS-18xx holder ensures these conditions through a rigid mechanical frame and a spring-stabilised probe mounting system.
Compatible ACS shear-wave DPC transducers:
• S1802 — 90 mm pitch
• S1801 — 70 mm pitch
• S1807 — 50 mm pitch
• S1808 — 30 mm pitch
Typical applications with the A1220 MONOLITH UPVT:
• indirect shear-wave velocity measurements
• detection of cracks, voids and anisotropy
• material stiffness evaluation
• surface-access diagnostic testing of concrete and stone structures
| Parameter | Value |
| Avaiable pitch sizes | 30 mm, 50 mm, 70 mm, 90 mm |
| Compatible DPC transducers | S1802, S1801, S1807, S1808 |
| Wave type | Shear (S-wave) |
| Transmission mode | Indirect (surface) |
| 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 shear-wave alignment support |
• IS-18xx Indirect Shear-Wave Holder Frame
• Dual DPC shear probe mounting brackets
• Spring-loaded coupling mechanism
• Shear-wave orientation markers
• 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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