PEM-ATC0 pages

PEM ADVANCED THERMAL
CONTROL (PEM-ATC TM)

T E C H N O L O G Y

F O R

P O L A R I Z A T I O N

M E A S U R E M E N T

PHOTOELASTIC MODULATORS

PRODUCT ANNOUNCEMENT

Hinds Photoelastic Modulators with Advanced Thermal Control
Hinds Instruments, Inc. announces the PEM-ATC TM, a
photoelastic modulator with advanced thermal control. This new
PEM design offers long term stability and freedom from drift
caused by ambient temperature variations.
The PEM-ATC is equipped with a proprietary PID controller,
internal heating, and a temperature sensor. Through the use
of heater operated PID feedback control, the interior of the
PEM optical head is held at a constant 90°F or 32C, even when
ambient temperatures are uctuating.
Figure 1, demonstrates the stability of the PEM signal when ambient temperatures are changing. With
temperature uctuations from 66°F to 72°F the PEM signal standard deviation was only 0.05% of the
normalized signal
(R/DC) over 60
Figure 1. PEM signal with uctuating ambient temperature.
hours.
Figure 2,
demonstrates the
stability of the
PEM-ATC. The blue
line represents 3
hours of PEM signals
without thermal
control. Note the
upward, relatively
linear drift of the
signal. Traditional
approaches for
addressing this
include making periodic offset corrections. The red line represents 3 hours of PEM data with Advanced Thermal
Control. With this advanced PEM
design there is essentially no drift
Figure 2. Percent change of PEM signals over time. Note the most stable
over the three hour time frame shown
signal in red is data taken with the PEM Advanced Thermal Control.
on this graph.
The ATC option is currently available
for the I/FS50 model (fused silica) but
available for other models on request.
For PEM applications requiring high
sensitivity and thermal stability,
this new option provides a cost
effective solution with little impact on
experimental footprint.

Hinds Instruments, Inc / 7245 NW Evergreen Pkwy / Hillsboro, OR 97124 / USA
T: 503.690.2000 / F: 503.690.3000 / sales@hindsinstruments.com / www.hindsinstruments.com
PEMlabs is a Trademark of Hinds Instruments, Inc. Manufactured in USA
© 2012 Hinds Instruments, Inc. All rights reserved. Printed in USA