Polariscope Strain Viewer for Glass

Presto's Glass & Plastic Polariscope - Strain Viewer is the best and highly effective testing device which is used to measure the residual stresses and strains that are introduced during the manufacturing process of the products that severely affects the strength of the product. At the time of manufacturing, residual stresses and strains appear that have a significant effect on the strength of the product. This damaging effect may contribute to the failure of the product. In the photoelastic technique, polarized light is passed through the products made of transparent glass or plastics to interpret quality and quantity in an optical interference pattern. The residual stress is measured in glass products and strains are measured in plastic moldings, castings, or extrusions.

The Presto’s Adjustable Glass in Plastic Strain Viewer – Polariscope (PSPL-G20) is suited for a range of applications in the optical strain viewing field of the glass and plastics industries. This testing instrument can be tilted through 180° and clamped in any position. It has a 190mm diameter field of view and working space which is adjustable between 290 mm and 440 mm. Access can be gained to the lamphouse for the changing of the lamp when necessary, by removing the four screws which are situated in the front panel. The unit must be disconnected from the electrical mains supply before gaining access to the inside of the lamphouse. The lamps are 2 pin compact fluorescent 9W cool white lamps. The optical layout comprises an analyzer, polarizer, and full-wave (tint) plate. The tint plate can be swung into, or out of, the field of view as required by using the turn knob on the analyzer mount.

Photo-elasticity is a major phenomenon that occurs in PET, Preforms, and Glass Products. Photoelasticity means the change in the refractive index of the material when there is non-uniform strain distribution throughout the material. Photo-elasticity can be a great problem for the manufacturers of PET and glass products as this is a great flaw in the quality of the products. Presto’s Adjustable Glass in Plastic Strain Viewer – Polariscope (PSPL-G20) is manufactured with wooden materials to provide an extended service life and accurate quality testing procedures. This testing instrument is provided with a smooth and attractive finish in brown color. The instrument is also provided with an instruction manual and a copy of the standard.

If you want to commence the test easily then you need to follow some essential steps. Here we have listed those steps below:

• Plugin the mains lead to an electrical socket of 3 pin-5 Amp configuration.
• Clean the viewing area and test the platform.
• Put the sample to be tested on the sample placement area by maintaining the center with respect to the viewing glass with its principal stress P in the horizontal or vertical direction. (The background of the viewer will be violet-red in color).
• Put on the light source to test the sample.
• Manually analyze the sample. It will reveal colors and these can be equivalent optical retardation, in degrees.

In this way, you can easily test the sample with the help of a Polariscope strain viewer for Glass and Plastics. Whenever you conduct the test using this testing instrument, then you should clean the viewing area and test the platform using a soft cloth.

Features of Polariscope Strain Viewer for Glass

There are many features you will get with the help of this testing instrument. Here we have listed some of the advanced features you will get with Presto Polariscope Strain Viewer for Glass & Plastic.

• This device is simple to operate and easy to understand
• The strain and stress are effectively measured for glass and plastics
• The equipment is provided with the calibration certificate traceable to NABL labs
• The machine has high-quality optics that provides a clear and sharp view.
• Two light intensities were offered: Monochromatic light and Sodium Lamp.
• Sharper and clearer optical viewing experience.
• Standard Template for viewing a sample at a 45º and 90º angle.
• Large Viewing glass area.

Technical specifications

• Working Space: 290mm and 440mm (Adjustable)
• Diameter of Viewing Field: 190mm
• Power Supply: Single Phase, 220V-240V, 50 Hz
• Option of tilting the viewing area: Up to 180 degrees
• Outer Body Construction: Wooden
• Light Source: 2 Pin Fluorescent 9W cool white lamps.