Blog & Event

DETECTION OF BROKEN FIBERGLASS IN WIND TURBINE BLADES

 

Non destructive evaluation of windmill blades using ultrasound is a challenging task. Microstructure of fiberglass and resin composites (GFRP) introduces dispersive effects on ultrasound waves, which is seen as grain noise and produces high attenuation to ultrasonic signals.

In this work, results of the inspection of a thin GFRP layer (3mm) using phased-array technique are presented. The goal is to detect the presence of broken fibers in the material. A 5MHz array was used, along with a novel C-Scan processing technique, that allows to detect broken fibers with a resolution above 1 mm.

Learn more 

PHASED-ARRAY INSPECTION OF GFRP BONDED JOINTS

 


Using epoxy adhesives to joint fiberglass composite (GFRP) parts is a common practice to build larger components. It is the case of windmill blades, where structural strips are bonded to the blade inner surface, both manufactured with GFRP. Structural resistance of the blade depends on these joints quality, and hence, non destructive evaluation is mandatory to guarantee component life.

Non destructive evaluation of GFRP using ultrasound is a challenging task. Microstructure of fiberglass and resin composites introduces dispersive effects on ultrasound waves, which is seen as grain noise and produces high attenuation to ultrasonic signals. The traditional approach to overcome these problems is using low frequency transducers (typically 500 kHz), at the expense of loosing resolution, and hence, the capability to detect small defects or to inspect low thickness components.

In this work, results from the inspection of a strip bonded joint of a windmill blade using phased-array are presented. It is demonstrated how this method provides high resolution images at the same time inspection time is greatly reduced.

 

Learn more 

STEEL BOLTS INSPECTION WITH ULTRASOUND ARRAYS

 

In this work, the evaluation of brake disc fixation bolt integrity, used at high speed train wheels, is presented. Inspection procedure is detailed, and it is shown how progressive focusing technique (ProFoc®) ensures the best lateral resolution at any inspection depth.

The goal of the inspection is to detect three artificial notches that emulate a broken thread at different depths. Figure 2 shows resultant images with three configurations: (a) fixed focus at 20mm, (b) fixed focus at 40 mm and (c) progressive focusing (ProFoc®).

A quite short deep of field (DOF) is obtained when a single focus is applied, which prevents to evaluate the whole component with a single image. Progressing focusing technique overcomes this problem, because it maintains a constant angular resolution at any inspection depth.

 

Learn more 

ULTRASOUND ANDROID SMARTPHONE APPLICATIONS

 

DASEL launches a series of handheld tools for NDT, based on Android Operative System.

Ultrasound Calc, Phased Array Wizard and TOFD-Calc contain all calculations which are frequently required in industrial applications by NDT technicians of levels II  and III.

Learn more

                     

MOTORMOTION: STEPPER MOTOR CONTROLLER

 

MotorMOTION is a fully programmable stepper motor control unit, capable of simultaneously controlling up to 3 axes, with configurable acceleration ramp and micro-steps.

It also includes 6 limit switches and emergency stop switch control, and supports motor currents from 1.2A up to 5.6A. This unit is provided with an user software with B and C-Scan capabilities. It also includes a programming library for C++, LabView and Matlab developments.

Learn more

Industrial Scanners

Aerospace Inspection Solutions

Flaw Detectors

Ultrasonic Flaw Detectors

Phased Array

Guided Wave

Pulser-Receivers

Integrated Inspection Systems

Bar Inspection Systems

Tube Inspection Systems

NDT Systems Instrumentation

 

 

 

 

Advanced NDT applications

GLASSFIBER BROKEN FIBERS

GLASSFIBER UNBOND

RAILWAY STEEL BOLTS

CASTING INCLUSIONS

AUTOMOTIVE NODULARITY

Applications

Application Notes

Applications Support

PDF Library

Video Gallery

Software Downloads

Training Academy

Obsolete Products

ISO Certifications







 


 


Update client