|
Product description (FOS-DTN): Double-cell Twisted Nematic (DTN)
liquid crystal shutter offering ultra-short pulses of OPEN state
(exposure-times) of less than 50 microseconds (0.05ms). FOS-DTN shutter
comprises two (2) pieces individual TN shutter elements bonded
together to form a complete stack.
Product
characteristics: FOS-DTN shutter provides
ultra-short pulses of OPEN state suitable in applications where short
exposure periods are required down to 50 microseconds
(0.05ms). Maximum transmittance when in OPEN state approximately 30%
for incident unpolarised light. High level of extinction when in CLOSED
state. Custom sizes from 5 x 5mm up to maximum 14 * 16 inches
available.
Technical description: FOS-DTN liquid crystal shutter comprises
two individual liquid crystal shutters bonded together to form a complete
"stack". Application of voltage to the first shutter switches the complete
"stack" to the OPEN state, whereas application of voltage to the second
shutter thereafter switches the complete "stack" back to the CLOSED state
once again.
It is therefore the ACTIVATION switching
speeds of the two individual liquid crystal shutters that control the
switching cycle of the complete "stack" and as such employment of the
slower RELAXATION switching mechanism is avoided for a single exposure
period ("pulse" of OPEN state period).
Moreover, since the ACTIVATION switching speed
is a direct function of the applied voltage, the switching of the complete
"stack" for a single exposure cycle comprising CLOSED-OPEN-CLOSED state is
extremely fast when elevated operating voltages are employed.
The time difference (phase shift) between when
voltage is applied to the first shutter and when voltage is applied to the
second shutter thereafter controls the overall "time duration" of the
complete exposure pulse.
It is also noted that
the minimum time-period ("re-loading" time) between successive
exposure-periods is limited by the summation of the RELAXATION switching
speeds for the two individual liquid crystal shutter elements. In
practice, the "re-loading" time is approximately 20ms at room
temperature.
Click here to download technical datasheets for
FOS-25x30-DTN shutter.
Please see Pricing & Ordering for ordering of product.
|
FOS-25x30-DTN
Size 25x30mm: "Double-cell"
Twisted Nematic (DTN) optical-shutter light valve.
Outer-dimensions 25x30mm with
total thickness
4.7mm. Click here to download technical datasheets.
|
|
| 
