akrometrix Table Top Shadow Moire Manual do utilizador - Página 7

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Table 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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