akrometrix Table Top Shadow Moire Benutzerhandbuch - Seite 7
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Seite druckenTable Top Shadow Moiré User Manual
Grating
Sample Drawer
Camera
Light Source
It is important to understand the basic design and operation of these components in
order to fully utilize the system's capabilities. See the following sections for a brief
description of each component.
1.4.1 Grating
Each TTSM system is provided with a single Ronchi ruled grating with either 100 or
200 lines per inch. These frequencies, when combined with appropriate camera lenses,
allow the user good accuracy at a variety of part sizes and working distances. Please see
Table 1.1 and the Akrometrix Optical Techniques and Analyses 101 document for more
details.
A linear motion stage drives the grating up and down to achieve phase stepping in
the TTSM. The system's mirror is mounted to the stage assembly, and moves along with
it. A single motor in the back of the unit is attached to a linear motion stage that provides
a 5.08 cm (2 inch) range of travel. A limit switch prevents the motor from operating past
the stage travel limits. Control over the motor is done exclusively using the Surface
Measurement software. Please see the Surface Measurement User Manual for
instructions on its use.
1.4.2 Sample Drawer
Samples are supported by a sliding aluminum tray contained within a drawer which
can be manually extended from the system for easy access. A catch locks the drawer into
place once it is fully pushed inside the machine.
1.4.3 Camera
The system is equipped with a single 2.0 megapixel camera to capture image data.
Multiple of lenses are provided with the camera, allowing the user control over field of
vision and level of zoom. Table 1.1 shows the relationship between lens size, grating
frequency, and maximum field of vision.
Grating/Lens
100 LPI Grating
200 LPI Grating
1.4.4 Light Source
An LED light source feeds light to a pair of fiber optic line lights which are pointed at
the mirror in the back of the unit. The light source should generally be set to maximum
intensity for shadow moiré tests to maximize contrast.
Table 1.1 Grating Frequency, Lens Size, and Field of Vision
4.4-11 mm Lens
FOV: 310x300mm
FOV: 302x230mm - 310x300mm
40-5000-8100 Rev. A
12-36 mm Lens
Not compatible
FOV: 206x154mm – 276x209mm
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