Ultrasonic testing has always come with a practical nuisance attached. Sound does not travel usefully from a transducer into a part through air, so conventional ultrasound needs a couplant — gel on the surface, or the whole part immersed in a water tank. For a lot of inspection that is merely inconvenient. For some parts it rules the method out entirely.
Laser-excited acoustics removes the couplant. It is worth understanding what that changes, and what it does not.
How it works
A pulsed laser is directed at the part. Where it lands, it generates an ultrasonic wave inside the material — no contact, no fluid. The returning ultrasound is picked up by a membrane-free optical microphone, which detects sound in air rather than through a coupled transducer.
The result is a genuinely contactless ultrasonic inspection: XARION's laser-excited acoustics reaches the sensitivity of liquid-coupled ultrasound while touching nothing, and resolves sub-millimetre internal defects and delamination.
What that changes in practice
- No water tank, no gel. Nothing to apply, clean off, or dispose of — and nothing that can contaminate a part or a clean environment.
- Parts that cannot get wet can be inspected. Honeycomb-cored structures are the obvious case: water ingress into the core is a defect in itself.
- Speed. Scanning runs up to 2000 mm/s, which moves the technique from sampling into full-coverage inspection.
- Tolerance to positioning. The method is robust to stand-off distance and angular misalignment, which matters on curved and contoured parts.
What it is used for
The natural home is composites and bonded structures, where the defects that matter are separations rather than missing material:
- Delamination in monolithic carbon-fibre laminates
- Disbonds and porosity in honeycomb-sandwich panels
- Adhesive bond integrity, where there is often nothing to see from outside
- Aerospace, defence and battery structures, where these material systems concentrate
Where it fits against CT
This is the question we are asked most, and the answer is that they are not competitors.
Computed tomography reconstructs a full 3D volume: every void, its exact position and size, measurable afterwards in software. It is unmatched for a detailed investigation of one part, and it is how you answer "what exactly is in there".
Laser ultrasound answers a different question — is this bond sound, is there delamination here — across a large area, quickly, without a cabinet and without immersion. It is ultrasound, not X-ray: it produces no CT volume, and it is not a substitute for one.
In a composites shop the two coexist comfortably. Ultrasound covers area and screens production; CT resolves the ones that fail screening and any part that needs a definitive answer.
Where it is not the answer
Metal castings and dense assemblies. Porosity in a metal part is CT territory, or radiography.
Composition questions. Ultrasound says nothing about what a material is made of — that is micro-XRF.
Machines rather than parts. If the goal is catching a bearing or gearbox degrading in service, that is continuous acoustic monitoring, a different discipline from inspecting a component.
Worth a look if
You are inspecting composites or bonded joints today with immersion or hand-applied couplant, and the limits you feel are throughput, part contamination, or geometry the tank cannot accommodate. Those are the constraints this removes.
We can arrange a demonstration on your own parts in Israel — talk to us and tell us what you are trying to see.