The present invention discloses a method for detecting a microstructure of a functionally graded material based on digital acousto-optic holography, including the following steps: excite a sample with an ultrasonic wave; record a light wave; form a single tomographic acousto-optic hologram; perform numerical reconstruction of phase information, and perform global detection. The present invention uses an acoustic-optic modulation device to modulate a laser light source of a laser of a laser device to form two light waves of different frequencies. The two light waves each constitute a Mach-Zehnder interference system to record reflection wave information and transmission wave information of an ultrasound, and are finally combined and recorded in the same hologram to form the single tomographic acousto-optic hologram.

A system for generating holographic images or videos comprising a camera array, a plurality of processors, and a central computing system. A method for generating holographic images can include receiving a set of images and processing the images.

Briefly stated, technologies are generally described for providing a computer-generated holography (CGH). Example devices/systems described herein may use one or more of a server device and/or a client device. The server device may be configured to provide CGH data to a client device including a holographic image display unit. The server device may receive information on the holographic image display unit from the client device, calculate the CGH data from three-dimensional image data and the information on the holographic image display unit, and/or transmit the CGH data to the client device. The client device may be configured to provide a holographic image. The client device may reconstruct the holographic image on the holographic image display unit using CGH data and a reconstruction beam, transmit information on the holographic image display unit to the server device, and/or receive the CGH data from the server device.

A vehicle such as a helicopter may scan a scene using a transmitter mounted on a rotating part like a rotor and a receiver mounted on a body of the vehicle. Based on a Doppler shift caused by the rotation of the rotating part, patterns may be recorded and used to develop a holographic image of the scene.

Provided are on-axis and off-axis digital hologram generating device and method.

The on-axis and off-axis digital hologram generating device includes a controller and an input window configured to receive user input of hologram property information. The controller is configured to access a phase file of an object stored in a storage device, convert the phase file of the object into object phase information in a useable form, generate digital object light information based on a light property of object light input by a user and the converted object phase information, and generate a digital hologram based on (i) the received hologram property information, (ii) the generated digital object light information, and (iii) digital reference light information inputted by a user.

According to an aspect of the present inventive concept there is provided a device for imaging of a microscopic object, the device comprising: an array of light sensitive areas, each being sensitive to detect light spanning a wavelength range of at least 400-1200 nm; at least one light source configured to generate light at a plurality of wavelengths within the wavelength range, comprising at least one wavelength in a visible part of the wavelength range and at least one wavelength in a short-wave infrared, SWIR, part of the wavelength range, and arranged to illuminate the microscopic object with the generated light such that at least part of the light is scattered by the microscopic object; wherein the device is configured to transmit the scattered light and non-scattered light, from the same light source, to the array of light sensitive areas configured to detect an interference pattern formed between the scattered light and the non-scattered light, for each wavelength.

According to an aspect of the present inventive concept there is provided a device for imaging of a microscopic object, the device comprising: an array of light sensitive areas sensitive to detect light spanning a wavelength range of at least 400-1200 nm; at least one light source comprising at least a first point of operation in which the at least one light source is configured to generate visible light, and a second point of operation in which the at least one light source is configured to generate infrared light, and being arranged to illuminate the microscopic object such that light is scattered by the microscopic object; wherein the array of light sensitive areas is configured to detect an interference pattern formed between the scattered light and non-scattered light; the device being configured to be set in a selected point of operation from the at least first and second points of operation, for detecting the interference pattern for imaging the microscopic object at a wavelength defined by the selected point of operation.

Disclosed is an apparatus of analyzing a depth of a holographic image according to the present disclosure, which includes an acquisition unit that acquires a hologram, a restoration unit that restores a three-dimensional holographic image by irradiating the hologram with a light source, an image sensing unit that senses a depth information image of the restored holographic image, and an analysis display unit that analyzes a depth quality of the holographic image, based on the sensed depth information image, and the image sensing unit uses a lensless type of photosensor.

The invention relates to a method for detecting a measured value (dϕ/dx, M). According to the invention, provision is made for a sinusoidal excitation signal (Ue) with a predetermined excitation frequency (f), with or without a superposed DC component (Uoffset), to be fed to an input of a component (100, C), for at least one electron holography measuring step to be carried out, in which an electron beam (Se) is directed on the component (100, C), said electron-beam penetrating and/or passing the component (100, C) and subsequently being superposed with a reference electron-beam (Sr), and for an electrical hologram (EHG) arising by interference of the two electron beams (Se, Sr) during a predetermined measurement window (F) to be measured and the phase image (PB) to be ascertained therefrom, and for the measured value (M) to be formed on the basis of the phase image (PB), wherein the temporal length (Tf) of the measurement window (F) of the electron holography measuring step is shorter than half the period (T) of the sinusoidal excitation signal (Uc).

A LIDAR system comprises a spatial light modulator for displaying a diffractive pattern comprising a hologram of a structured light pattern that is projected onto a scene. The structured light pattern comprises an array of light spots and a light source for illuminating the diffractive pattern to form a holographic reconstruction of the light pattern. A detection subsystem comprises light detection elements that detect light from a respective individual field of view (FOV) of the scene and output a respective detected light signal. A first subset of the individual FOVs are illuminated by a light spot of the light pattern and a second subset are not illuminated by the light spot. The system comprises a processor for identifying noise in a first detected light signal, relating to an individual FOV of the first subset, using a second detected light signal, relating to an individual FOV of the second subset.