Sensor data is captured with a sensor. The sensor data includes a lens-position of a prescription lens relative to a reference point of an optical coherence tomography (OCT) system. A mirror of a reference arm of the OCT system is positioned at an optical pathlength between an eye region of the prescription lens based at least in part on the sensor data. An OCT signal is generated while the mirror is positioned at the optical pathlength. At least one depth profile is generated that includes the prescription lens and the eye region.

A low-coherence interferometer apparatus for determining information on interfaces of an object including: a polychromatic light source; an optical system generating a measurement optical beam and a reference optical beam; a delay line introducing a variable optical delay between the optical beams; detection optics combining the beams, and producing a spectral signal representative of an optical-power spectral density of the resulting interference signal; a control and processing module acquiring a plurality of spectral signals for a plurality of optical delays, determining, for each spectral signal, optical retardation information between interfering beams within a spectral measurement range, analyse the variation in the retardations, and assign the optical retardation determined on the basis of the different spectral signals to interface curves, corresponding to straight lines with positive, negative, zero or almost-zero gradient, depending on the respective optical delay of the acquisition of the spectral signals, and to deduce information of the object.

A measuring device and measuring method for capturing a surface topology of a workpiece uses an optical coherence tomograph having a reference arm guided by a manipulator or a deflection unit to position a measuring region of the scanner. The reference arm is guided along an actual track, which at least partially deviates from an intended track due to disturbing influences like lag errors of the manipulator. An actual distance (d.sub.m) between a zero point of the measuring region and a workpiece surface is measured at at least one measuring point of the actual track. A planning path length (I.sub.p) of the reference arm is established for the at least one measuring point for the compensation of the disturbing influences, and the measured actual distance (d.sub.m) is normalized to a standard distance (d.sub.n) with the aid of the planning path length (I.sub.p).

A measuring device and measuring method for capturing a surface topology of a workpiece uses an optical coherence tomograph having a reference arm guided by a manipulator or a deflection unit to position a measuring region of the scanner. The reference arm is guided along an actual track, which at least partially deviates from an intended track due to disturbing influences like lag errors of the manipulator. An actual distance (d.sub.m) between a zero point of the measuring region and a workpiece surface is measured at at least one measuring point of the actual track. A planning path length (I.sub.p) of the reference arm is established for the at least one measuring point for the compensation of the disturbing influences, and the measured actual distance (d.sub.m) is normalized to a standard distance (d.sub.n) with the aid of the planning path length (I.sub.p).

In some embodiments, systems, methods, and media for multiple reference arm spectral domain optical coherence tomography are provided which, in some embodiments, includes: a sample arm coupled to a light source; a first reference arm having a first path length; a second reference arm having a longer second path length; a first optical coupler that combines light from the sample arm and the first reference arm; a second coupler that combines light from the sample arm and the second reference arm; and an optical switch comprising: a first input port coupled to the first optical coupler; a second input coupled to the second coupler via an optical waveguide that induces a delay at least equal to an acquisition time of an image sensor; and an output coupled to the image sensor.

The present invention aims to obtain a tomographic image free from image noise due to reflection on a container wall surface and having a good image quality by a simple configuration. In a FD-OCT imaging apparatus which images an imaging object stored in a container having an optical transparent wall part tomographically, when the focal depth is set such that a distance D from a first surface Sa of the wall part on the side of the imaging object to a focal point FP of the objective optical system is smaller than a predetermined threshold value smaller than a thickness T of the wall part, the distance between a second surface Sb of the wall part on a side opposite to the imaging object out of the wall surfaces and a reference plane which is perpendicular to the optical path of the illumination light and to which an optical path length is equal is set a value equal to the thickness of the wall part.

Retinal imaging systems and related methods employ a user specific approach for controlling the reference arm length in an optical coherence tomography (OCT) imaging device. A method includes restraining a user's head relative to an OCT imaging device. A reference arm length adjustment module is controlled to vary a reference arm length to search a user specific range of reference arm lengths to identify a reference arm length for which the OCT image detector produces an OCT signal corresponding to the retina of the user. The user specific range of reference arm lengths covers a smaller range of reference arm lengths than a reference arm length adjustment range of the reference arm length adjustment module.

A device for measuring the parameters of phase elements and dispersion of optical fibers, characterized in that it contains: a light source, serially connected to fiber optic coupler, one of whose arms constitutes a part of the reference arm, and whose second arm constitutes a part of the measurement arm of the device, and a motorized linear stage is mounted on the arm of the device. One of the arms of the device is connected to at least one detector, and at least one collimator is placed in at least of the arms of the device, at least before the phase element. A method of measuring the parameters of the phase element and the dispersion of optical fibers is conducted in two stages, wherein the first stage assumes the calibration of the device and the second stage is the proper measurement.

Provided is an ophthalmologic apparatus including: an acquisition unit configured to acquire tomographic information of an eye to be examined using information on interference light between return light from the eye to be examined, which is irradiated with measurement light, and reference light; and a vitreous structure detection unit configured to detect a vitreous structure of the eye to be examined using tomographic information of the eye to be examined that is acquired after at least one of the difference in optical path length between the measurement light and the reference light and the in-focus position is controlled, wherein the acquisition unit is configured to acquire tomographic information of the vitreous structure.

Retinal imaging systems and related methods employ a user specific approach for controlling the reference arm length in an optical coherence tomography (OCT) imaging device. A method includes restraining a user's head relative to an OCT imaging device. A reference arm length adjustment module is controlled to vary a reference arm length to search a user specific range of reference arm lengths to identify a reference arm length for which the OCT image detector produces an OCT signal corresponding to the retina of the user. The user specific range of reference arm lengths covers a smaller range of reference arm lengths than a reference arm length adjustment range of the reference arm length adjustment module.