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Shack–Hartmann wavefront sensor

Type of optical instrument

Shack–Hartmann wavefront sensor

Type of optical instrument

Shack–Hartmann system in clinical optics: Laser creates a virtual light source in the retina. The lenslet array creates spots in the sensor according to the wavefront coming out of the eye.
Inverse of the Shack–Hartmann system in clinical optics: A set of patterns is displayed on the screen, the user aligns/overlaps them in a single image pressing buttons.
A schematic illustration of a SHWFS.
Operations of a single lenslet in a SHWFS.

A Shack–Hartmann (or Hartmann–Shack) wavefront sensor (SHWFS) is an optical instrument used for characterizing an imaging system. It is a wavefront sensor commonly used in adaptive optics systems. It consists of an array of lenses (called lenslets) of the same focal length. Each is focused onto a photon sensor (typically a CCD array or CMOS array

The design of this sensor improves upon an array of holes in a mask that had been developed in 1904 by Johannes Franz Hartmann as a means of tracing individual rays of light through the optical system of a large telescope, thereby testing the quality of the image. |editor1-first=F. Dow |editor1-last=Smith

Shack–Hartmann sensors are used in astronomy to measure telescopes and in medicine to characterize eyes for corneal treatment of complex refractive errors. |name-list-style=amp | volume = 17 | hdl-access = free |name-list-style=amp | publisher = Springer Recently, Pamplona et al. |url-status = dead |hdl-access= free

References

References

  1. (August 2019). "Accounting for focal shift in the Shack–Hartmann wavefront sensor". Optics Letters.
  2. (August 2019). "Centroid error due to non-uniform lenslet illumination in the Shack–Hartmann wavefront sensor". Optics Letters.
  3. Scheiner, "Oculus, sive fundamentum opticum", Innsbruck 1619
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