ET1619RA-TV Centration Tester

LED light source: 589 nm Optical-rotation accuracy: ±0.09° Sample-cell length (horizontal direction): 101.3 mm ± 0.8 mm

The PS-3237 wireless polarimeter provides Bluetooth and USB connectivity for analyzing chiral compounds on an iPad®, Chromebook™, Android tablet, or computer. It is ideal for introductory organic-chemistry and biochemistry experiments, where chiral compounds are a major focus. The PASCO wireless polarimeter operates as follows: Plane-polarized light passes through a vertical sample containing a chiral compound, then through an analyzer to a detector. Optical rotation is determined from the angle between the starting position and the position of optimum transmission at the crossed polarizer. Students use rotation data to calculate sample concentration. Specific rotation, the degrees of rotation per gram/milliliter of solution, is an intrinsic property that can distinguish molecules or identify racemic mixtures. In substances with chiral atomic centers, light propagation is anisotropic: Light vibrating in one dimension travels more slowly than light vibrating in another dimension at 90 degrees to it. One component, such as the horizontal component, is slowed, rotating the resultant vibration plane as it passes through the solution. The second polarizer is then rotated until maximum intensity reaches the detector. The angle from its initial to its final orientation is the optical rotation. The polarimeter uses monochromatic light for the following reason: Just as red light is refracted less than violet in a prism, red light is rotated less than orange in an optically active solution, orange less than green, followed by blue and violet. This can be observed with the OS-9477A polarimeter demonstration set: As a crossed polarizer is rotated to transmit the next color through the aligned polarizing arrangement, a Karo syrup solution between two large polarizers changes gradually from red to violet.

Transmission Centering Measurement Instrument: CS-A1100(CS-A1100S). Uses collimation measurement and an automatic centering navigation system for more accurate and easier centering inspection. Optional software supports statistical analysis and printing. Optional vacuum holding and an automatic rotary stage improve measurement stability for small-aperture lenses. It offers a wide measurement range and good cost effectiveness.

Reflection Centering Measurement Instrument: US-A1. Developed specifically for small lenses, it uses reflection measurement and a dedicated rotary stage for rapid centering measurement of small-aperture lenses down to φ1mm. It is particularly suitable for endoscope lenses and other small-aperture products.

Combined Transmission and Reflection Centering Measurement Instrument: TR-A1. Supports both transmission and reflection measurement modes and a variety of measurement methods. Optional automatic rotation and vacuum holding provide stable measurements.

Transmission Centering Measurement Instrument for Cementing: CS-A3000. Automatically enlarges the display to simplify cementing. Settings can be selected using a touchscreen, with real-time display of centering deviation during operation.