The IR 124 Motion Compensation Lens can be used to extend the applicability of the DeltaTherm Stress Measurement System. When DeltaTherm images have unacceptable "edge effects" caused by the subject structure moving in sync with the loading, the motion compensator can be used to improve image quality.

As shown in the photo above, the Motion Compensation Lens attaches to the front of the camera head with a bayonet mount. (Click here to view photo enlargment). The IR124 device is a 75mm f/3.35 lens attached to a servo-actuator that moves the lens in a linear motion in sync to the structural loading. The operator adjusts amplitude, phase, and direction of motion.

The amount of compensation available depends on the loading frequency and distance to the target. At 10 Hz the compensation is up to 12% of the field-of-view (FOV). Compensation for motions at frequencies as high as 80 Hz can be attained. The system is also capable of following a variable amplitude (random) motion.

The Motion Compensation Lens works by moving a lens across the line of view of the camera. The motion of the lens is along a line, therefore the compensation is also along a line. The whole field-of-view is "compensated" equally. This type of motion compensator is not suitable for more complicated motions such as rotation, elongation, or distortion of a specimen.

Specifications of Optical Component

Type of compensation:	Linear
Size:	11cm high, 11 cm long, 9 cm wide
Weight:	0.5 kg
Minimum focus distance:	25 cm
Field-of-View (FOV):	2.5 cm at 25 cm stand-off distance
Aperture:	f/3.35

Performance

Frequency	%FOV
75	4%
70	5 %
60	6%
40	14%
20	15%
10	12%
5	12%

Click here to view a PDF of the IR 124 Motion Compensation Lens.
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