The Polariscope
The Polariscope
For more than 60 years Tiedemann has been built a large number of suitable polariscopes for different applications and customer demands.
Diffuse Light Polariscope
One popular device is the Tiedemann diffuse light polariscope with compensation analyser. This polariscope can be conducted in the most qualitative and quantitative photoelastic studies. All filters are glued between glass plates to avoid scratches and newton rings and lead to the best optical quality and life time.
Portable Polariscopes
Portable polariscopes are diffuse light polariscopes for linear and circular semi quantitative photoelasticity. Because of its versatility, its ease of handling and reasonable price, it is very often used. All parts of the polariscope (lamps, diffuser, polarizers and cable) are in the housing virtually packable. The fold-down front lid serves as a base plate, into which the filter can be inserted, and the model is placed. All filters are glued between glass plates as well. Furthermore, the filters can also be used for other applications.
Tiedemann offers different portable polariscopes:
The Type C has white light only and two single polarization filters for linear polarisation. The field of view is 190 x 190 mm.
Type D is somewhat larger with a field of 215 x 215 mm. The light can be switched between white and sodium light. The filters for D and the following polariscopes are made for linear and circular photoelasticity. The filters of polariscope D can be fixed in a special attachment for overhead projectors.
The larger polariscopes are Type AQ with a field of view of 390 x 390 mm and Type BQ with 470 x 470 mm
Lecture Polariscopes
Special polariscopes are need for lectures in bigger auditoriums. We offer two different options, the LED polariscope for beamer and another one for overhead projector.
LED Polariscope for Beamer
This polariscope is made by a flat light box for white light with filter for circular polarisation. Further a camera is mounted in der right position with the second circular polarization filter. The camera can be connected via USB to a computer. This polariscope may be placed vertical or horizontal and fits with all our demonstration models. The lecturer may explain the stress pattern in the models with a view on his monitor or by using our analysation glasses.
Of course all our polariscopes can adapted to a camera for beamer presentations.
Polariscope for Overhead Projector and Flat Models
A simple way to demonstrate stress conditions in models by photoelasticity offers the overhead projector attachment. Between two frames with streched polarization films simply placed on the overhead projector, flat loadings frames can be placed.
Specifications
Field of view
250 mm x 250 mm
Load frames
3 pieces
Models
srew wrench, L-frame with bearing circular disc, U-frame
Special Polariscopes
Besides the polariscope models shown above we offer special solutions for large industrial applications or museums. Polariscopes with nearly any size can be created. They are used e.g. for the investigation of safety glass in the automotive industry, stretched films in the plastic industry or for presentations on exhibitions or museums.The previously manufactured special polariscopes range from fields of view of 48 x 48 cm up to 191 x 126 cm. They can be standing or hanging. They consist of a light box with white lighting, a frosted glass and the circular polarization film. The analyser could be stretched in a frame the same size. Alternatively, instead of a large analyser a portable analyzer in the size of about 48 x 48 cm is an option as well as our analyser glasses.
These special polariscopes are available on request only.
Reflection Polariscope
Unlike the transmitted light polariscopes above the reflection polariscope works as an incident light polariscope, even over long distances. The model is irradiated with almost parallel light. On the back of the only a few millimeters thick model a matte silver paint is applied. The model can then be loaded in the loading frame or alternatively is glued on the body to be examined.
The polarized light passes through the model that is reflected on the back side and passes through the analyser to a camera that displays the result on a computer screen. The filter are stepper motor driven. Due to the double pass through the model the reflection polariscope is twice as sensitive as the transmitted light polariscope.
