Non-contact and non-destructive stress measurement instrumentation from Strainoptics, Inc.

Date: 2 October 2006
Source: Strainoptics, Inc.
Hall 12 / Stand C15VRP-100 Reflection Polarimeter SystemThe VRP-100 Reflection Polarimeter System enables fast, accurate, and non-destructive measurement of residual stress in the black paint region of automotive windscreens and other glass products with a sensitivity and precision effectively twice that of transmissive systems.

The VRP-100 permits accurate stress measurement within the black painted band, without the need for removing paint or making special parts. The polarimeter provides a full-field view of the edge region, allowing the operator to recognize problem areas at a glance. With the addition of an optional transmission illuminator, the system may also be used in transmissive mode for measuring clear glass.

In addition to high-efficiency polarization optics, the VRP-100 system is supplied with a 150-watt fiberoptic illuminator, a color-enhanced Senarmont analyzer, and a calibration gauge. Measurements are read directly from a calibrated scale.


The Series 1500-TG senses and reports the temper for each lite of glass emerging from the furnace in real time and clearly displays the value on a computer monitor in numerical and graph form, eliminating guesswork and operator errors. Because the process is almost entirely automated, no special operator training or skills are required.

The system's proprietary software relies on edge stress data to verify that measured stress values fall within industry standards for tempered glass, thereby reducing the need for break-pattern testing and providing a more accurate and repeatable representation of stress levels. Data acquired from each measurement is saved for off-line analysis or storage. Batch ID numbers, lehr number, shift or other user-defined information may be stored.

In addition to single-point or multiple-point edge stress values, the software also displays maximum, minimum, and average stress values for any single scan as well as for an individual batch and shift. The software allows stress values to be displayed in either psi or MPa units. Other features include fully automated system calibration and nearly maintenance-free operation.

GASP® polarimeters

GASP® polarimeters enable manufacturers of annealed, toughened (tempered) or heat-strengthened glass to inspect and measure surface stress easily and non-destructively, in order to comply with the new European EN-12150-2 mandates as well as ASTM C1048 and C1279 standards. Two models are available, one designed for flat surfaces and one intended for curved surfaces.

Widely used by glass manufacturers and fabricators as a cost-effective alternative to destructive fragmentation and mechanical strength testing, GASP polarimeters help prevent spontaneous breakage and other field failures in all types of heat-treated glass, insulated and laminated glass units, television picture tubes, and mirrors. GASP polarimeters are also used in safety glass applications to optimize furnace settings, assure conformance to specifications, and monitor residual stress values.

Each GASP unit is factory-calibrated and supplied complete with measuring wedge, one ounce of refractive index-matching fluid, an AC power supply/recharger (battery pack on laser models), user manual, practice sample, and instrument-quality carrying case. A video GASP system, which uses a CCD camera to display the image on a monitor, is also available.


The PES-1500 uses patented, non-destructive stress measurement technology, combined with proprietary and user-friendly Windows-based software and a PC workstation, to provide fast, accurate and repeatable readings of residual stress required for QC of automotive glazing. Because the process is almost entirely automated, no special operator training or skills are required.

To obtain an automatic measurement of stress in a particular sample, the operator simply passes a lightweight scanning probe along several small (typically 2 to 4 inch) segments of the edge being inspected. The software reports the maximum tensile and edge-compression stress values for each edge scan and also displays a graph of stress vs. position on the computer's monitor. The entire process takes only seconds to complete. In addition to point-to-point edge stress values, the software can also display maximum (peak) values for compressive and tensile stresses for any single edge scan or set of edge scans. The software allows stress values to be displayed in either psi or MPa units.

600450 Non-contact and non-destructive stress measurement instrumentation from Strainoptics, Inc.

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