Better transducers and inexpensive, high-accuracy gantries expand the scope of noncontact ultrasound imaging. The marriage of Airtech 4000 ultrasonic imagers and Techno-Isel gantries lets users generate ultrasound-image scans without having the probe touch the sample. The gantry accurately moves the transducer above a test specimen while recording transducer position. Gantry cost was a major factor because the manufacturing market is highly price-sensitive, says Neeraj Bhardwaj, a spokesperson for Second Wave. Ultrasound imaging is widely used in laboratories for nondestructive materials testing and in health care as a noninvasive diagnostic tool. But for it to work, transducers and an acoustic-coupling liquid must touch the specimen. This rules out testing of such materials as uncured plastics, green ceramics and powered metals, materials that are continuously rolled on a production line, or those with a large surface area to be scanned. But the advent of highly sensitive piezoelectric transducers and an inexpensive precision positioning system help overcome these limitations. Boals-burg, Pa., measure a sample's thickness, density, mechanical properties, and defects, as a transducer moves above its surface. This task is challenging because an extremely large acoustic impedance mismatch between air and sample can attenuate ultra-sound waves by seven orders of magnitude compared with water as the transmission media. This is where the better transducers come in. The updated transducers operate in air. They lose just 12 to 40 dB of sensitivity over a frequency range of 50 kHz to 5 MHz. In one configuration, a CNC gantry from New Hyde Park, N.Y., accurately positions the transducer over a test article. This makes possible the ultrasound imaging of large surface areas in the familiar C-Scan mode. C-Scan mode or pulse-echo gives planar images of samples at a specific depth. Airtech 4000 imagers use the two-axis linear motion control platforms to scan a 50 54-cm area.
Products & Services
Scientific imagers are high resolution systems used to capture moving or still images.
Ultrasonic transducers send and receive waves for many types of sensing. Examples include distance, proximity, level, nondestructive evaluation, web break detection, counting, and security applications.
Web Inspection Systems
Web inspection systems are used for the detection and/or automatic identification of web or web coating patterns and defects or problems such as streaks and blurs.
Touch Screen Displays
Touch screen displays are user-friendly input devices. The user touches the screen and the input is communicated directly to the computer.
Coordinate Measuring Machines (CMM)
Coordinate measuring machines (CMMs) are mechanical systems designed to move a measuring probe to determine the coordinates of points on a work piece surface.
Leak detection (sealing failures) in piping, pressure vessels, valves, pumps, compressors, ventilation systems and even vehicles can now be detected and evaluated using the amazing HiTECH SONAPHONE.
Topics of Interest
5.3 Classification of Transducers
We have tabulated the class of transducers and some important measurands in Table 5.1. The name of each class is keyed to the transduction mechanism, but its...
9.3 Non-contact excitation and detection of vibrational modes of drug tablets
Non-contact testing eliminates potential complications associated with sensor-tablet contact. In contact ultrasonic...
Lester W. Schmerr Jr.
Center for Nondestructive Evaluation and the Dept. of Aerospace Engineering Iowa State University Ames, Iowa 50011 firstname.lastname@example.org
It will be shown...
The tomographic images up to this point have generally been formed by illuminating an object with some form of energy (x-rays, microwaves, or ultrasound) and measuring the energy...
Chapter 1: Fundamental Models and Measurements for Ultrasonic Nondestructive Evaluation Systems
Chapter 2: Integrated and Flexible High Temperature Piezoelectric Ultrasonic...