Polariscope LP21POL and LP50POL
How a Polariscope Works for Glass Stress Analysis
A polariscope relies on the optical phenomenon of photoelasticity to detect and visualize internal stresses in transparent materials like glass. The device fundamentally consists of a light source and two polarizing filters: a polarizer and an analyzer. These filters are typically crossed at a 90-degree angle, meaning no light can pass through them initially. Read more
Compact LP21POL
- Designed for testing stress in glass
- AC and battery powered
Large observation window
Possibility of tilting 25 degrees.
The viewing window can be tilted
Easy to store after folding
| Light source | LED |
| Polarized light color | White |
| Control | Push button |
| Voltage | 100 - 240 V AC (24 V DC) |
| Working temperature | -10 °C - +40 °C |
| Base dimensions (w x d) | 200* x 240 mm |
| Height when folded | 100 mm |
| Max. height | 290 mm |
| Cat. | PO21WBAT |
Large LP50POL
A large polariscope allows for stress testing of larger glass or components. The light source is attached to a camera stand, allowing for positioning in hard-to-reach places. Stress in the glass can be observed directly, or a photo or video can be taken for later analysis, even off-site.
- Designed for testing stress in glass
- AC and battery powered
- Includes filter with phone clip for most phones and tablets
| Light source | LED |
| Polarized light color | White |
| Color temperature | 4000 K |
| Light power | 36 W |
| Luminous flux | About 3600 lm |
| Working temperature | -10 °C - +40 °C |
| Voltage | 100 - 240 V AC (30 V DC) |
| Dimensions (h x w x d) | 400 x 400 x 80 * mm |
| Illuminated area (w x h) | 350 x 350 mm |
| Observation screen dimensions (w x h) | 165 x 86 mm |
| Observation screen window dimensions (w x h) | 152 x 73 mm |
| Cat. | PO50WBAT |
When a piece of stressed glass is placed between these two filters, the internal tension alters the glass's optical properties, causing it to become birefringent (double-refracting). This birefringence shifts the polarization state of the light as it passes through the glass, allowing some of the light to successfully pass through the second filter (the analyzer). As a result, the previously invisible internal stresses are revealed as distinct, glowing interference patterns or colored bands, which directly indicate the location and magnitude of the tension. Go back
