Determining the position of an object in the beam path of an optical device
To determine a location of an object (100) parallel to the optical axis (120) of an optical apparatus (1), the thing (100) is illumined out of a primary illumination direction (210-1) and from a second illumination direction (210-2) and a picture (230-1, 230-2) is acquired in every circumstance. The position of the object (100) is determined based on a space (250) between imaging locations of the object (220-1, 220-2) from the pictures (230-1, 230-2).
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Determination of the position of an object to be imaged, parallel to the optical axis of an optical apparatus (z position), may be desirable for a variety of reasons. For instance, by way of the known z position, it may be possible to position theobject optimally inside the focal plane of the optical apparatus, in order to have the ability to create a specially sharp image of this item. In the case of objects that are extended perpendicularly to the optical axis, then it might be desirable to find out the zposition for different points of the item perpendicularly to the optical axis, so in order to have the ability to concentrate the appropriate image section. It could also be desirable to compile a peak profile of this item by way of optical techniques.
Existing techniques, as an example, permit determination of the z position by way of positioning the item at different reference positions. With the assistance of the sharpness of the item at the various reference positions, it’s then possibleto assess whether the item lies in the focal plane. Often, however, it can be possible to ascertain a sharpness of this item only with limited accuracy. Because of this, such a previously known technique might be comparatively inaccurate.Interferometric techniques for determining the z are furthermore known. Such techniques allow comparatively high accuracy in the determination of the z position; the corresponding devices, however, may be relatively intricate and costly.
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