A distance measuring arrangement for determining a distance from an object includes at least one light source for producing at least one first monochromatic and interference-capable light beam with a first wavelength and at least one second monochromatic and interference-capable light beam with a second wavelength, a multiplexer for coupling or combining the at least one first light beam and the at least one second light beam into a common measurement beam, an output coupling element for splitting the measurement beam into a reference beam and a signal beam, wherein the reference beam propagates along a reference path and wherein the signal beam propagates along a signal path, and a phase modulator that is arranged in the signal path and configured to modulate the phase of the signal beam periodically in time.

An acousto-optic modulator (AOM) laser frequency shifter system includes a laser configured to generate an incident beam, a first optical splitter optically coupled to the laser and configured to split the incident beam into at least one portion of the incident beam, at least one phase-shift channel optically coupled to the first optical splitter and configured to generate at least one frequency-shifted beam with an acousto-optic modulator (AOM) from the at least one portion of the incident beam received from the first optical splitter, and a second optical splitter configured to receive the at least one frequency-shifted beam from the at least one phase-shift channel and configured to direct the at least one frequency-shifted beam to an interferometer configured to acquire an interferogram of a sample with the at least one frequency-shifted beam.

An optical measurement system comprises a polarization beam splitter for dividing an incident beam into a reference beam and a measurement beam, a first beam splitter for reflecting the measurement beam to form a first reflected measurement beam, a spatial light modulator for modulating the first reflected measurement beam to form a modulated measurement beam, a condenser lens for focusing the modulated measurement beam to an object to form a penetrating measurement beam, an objective lens for converting the penetrating measurement beam into a parallel measurement beam, a mirror for reflecting the parallel measurement beam to form an object beam, a second beam splitter for reflecting the reference beam to a path coincident with that of the object beam, and a camera for receiving an interference signal generated by the reference beam and the object beam to generate an image of the object.

An optical measurement apparatus including: an irradiation optical system configured to irradiate, in a straight direction, a target area that includes a measurement area and a non-measurement area that is an area different from the measurement area, with irradiation light that includes a plurality of wavelengths; a reception optical system configured to receive measurement light that is transmission light or reflection light travelling from the target area as a result of the target area being irradiated with the irradiation light; and a calculation unit configured to generate a reception light spectrum that indicates a relationship between a wavelength and an intensity of the measurement light, for each position in the target area, based on a result of reception of the measurement light performed by the reception optical system, and calculate, for each wavelength, a transmittance or a reflectance of a measurement subject that is placed on the measurement area, based on the reception light spectrum thus generated, wherein the calculation unit calculates a transmittance spectrum or a reflectance spectrum of the measurement subject based on a first criterion spectrum that is the reception light spectrum that is based on the measurement light travelling from the measurement area when the measurement subject is not present on the measurement area, a second criterion spectrum that is the reception light spectrum that is based on the measurement light travelling from the non-measurement area, and a measurement spectrum that is the reception light spectrum that is based on the measurement light travelling from the measurement area when the measurement subject is present on the measurement area.

An ophthalmic apparatus that includes a light source of wavelength sweeping type; a measurement optical system; a reference optical system; a light receiving element that receives interference light; a sample clock signal generator that generates a sample clock signal from the light from the light source, the sample clock signal cyclically changing at equal frequency intervals; a signal processor that samples an interference signal based on the sample clock signal, the interference signal being outputted from the light receiving element when the light receiving element receives the interference light. The ophthalmic apparatus generates period data based on the sample clock signal, the period data indicating a relationship between a period of the sample clock signal and time; and determines a processing duration of the interference signal sampled at the signal processor based on the period data.

Interferometric speckle visibility spectroscopy methods, systems, and non-transitory computer readable media for recovering sample speckle field data or a speckle field pattern from an off-axis interferogram recorded by one or more sensors over an exposure time and determining sample dynamics of a sample being analyzed from speckle statistics of the speckle field data or the speckle field pattern.

Interferometric speckle visibility spectroscopy methods, systems, and non-transitory computer readable media for recovering sample speckle field data or a speckle field pattern from an off-axis interferogram recorded by one or more sensors over an exposure time and determining sample dynamics of a sample being analyzed from speckle statistics of the speckle field data or the speckle field pattern.

A testing device includes a positioning assembly and a testing assembly. The positioning assembly positions a workpiece. The testing assembly tests the workpiece. The positioning assembly includes a mounting seat defining a receiving slot for receiving and positioning the workpiece. The mounting seat includes a first positioning surface and a second positioning surface. The positioning assembly includes a side pusher configured to move toward the receiving slot. The side pusher includes a first pushing surface and a second pushing surface. When the side pusher is driven to move toward the receiving slot, the first pushing surface and the second pushing surface push two surfaces of the workpiece to make opposite two surfaces of the workpiece come in contact with the first positioning surface and the second positioning surface to position the workpiece in the receiving slot.

A three-dimensional measurement device includes an optical system that: splits an incident light into two lights; radiates one light to a measurement object and the other light to a reference surface; and emits the combined light; a first irradiator that emits a first light that comprises a polarized light of a first wavelength and enters a first element of the optical system; a second irradiator that emits a second light that comprises a polarized light of a second wavelength and enters a second element of the optical system; a first camera that takes an image of the first light emitted from the second element when the first light enters the first element; a second camera that takes an image of the second light emitted from the first element when the second light enters the second element; and an image processor that performs measurement based on the images.

An ophthalmic apparatus that includes a light source of wavelength sweeping type; a measurement optical system; a reference optical system; a light receiving element that receives interference light; a sample clock signal generator that generates a sample clock signal from the light from the light source, the sample clock signal cyclically changing at equal frequency intervals; a signal processor that samples an interference signal based on the sample clock signal, the interference signal being outputted from the light receiving element when the light receiving element receives the interference light. The ophthalmic apparatus generates period data based on the sample clock signal, the period data indicating a relationship between a period of the sample clock signal and time; and determines a processing duration of the interference signal sampled at the signal processor based on the period data.