The Variable beam attenuators (Liquid Crystal Variable Attenuator, LCVA) offers a continuous and highly precise control of the light intensity in real time. The transmission of the light can be adjusted as required by using the latest liquid crystal technology This makes the LCVA an indispensable component in optical systems where control and flexibility are required.
Functionality and structure
The variable beam attenuator is based on a liquid crystal retarder integrated between two crossed linear polarizers. The correct voltage controls the transmission:
- Maximum transmission: A half-wave delay rotates the polarization of the incoming light by 90° so that the second polarizer lets the light pass through.
- Minimum transmission: A delay of zero or a multiple of waves reduces the transmission to a minimum.
The continuous control allows precise adjustment of the transmittance based on the formula:
T(Θ) = 1/2 [1 – cos(Θ)] Tmax, where Tmax indicates the maximum transmittance.
Our variable optics stand for precision and reliability. If you have any further questions about the systems, please feel free to send us a non-binding inquiry. Further information about the products and all technical data sheets for each variant can be found here: meadowlark.com.
