Systems and methods disclosed herein provide for gas imaging. A gas imaging system comprises a lenslet array configured to receive thermal radiation from a scene and transmit a plurality of substantially identical sub-images of the thermal radiation; a birefringent polarization interferometer configured to generate an optical path difference for each ray of the plurality of sub-images based on a respective position of each ray entering the BPI, the optical path differences combining to form an interference fringe pattern; and an infrared focal plane array configured to capture a thermal image of the plurality of sub-images modulated by the interference fringe pattern due to the optical path differences through the BPI. The captured thermal image may represent a plurality of interferogram sample points of the thermal radiation from the scene, and may be used to construct a plurality of hyperspectral images of the thermal radiation from the scene.

One or more devices, systems, methods and storage mediums for performing continuously, full range optical coherence tomography (OCT) without losing A-lines are provided. Examples of such applications include imaging, evaluating and diagnosing biological objects, such as, but not limited to, for cardio and/or ophthalmic applications, and being obtained via one or more optical instruments, such as, but not limited to, optical probes (e.g., common path probes), catheters, endoscopes, phase shift units (e.g., galvanometer scanner) and bench top systems. Preferably, the OCT devices, systems methods and storage mediums include or involve a phase shift device including at least a galvanometer scanner. The galvanometer scanner is preferably applied with or to a voltage with a triangle shape, the voltage having continuity or absolute constant frequency to obtain continuous images without losing any A-lines. The method(s) may include background subtraction, image shifting to compensate phase shifts and a DC noise reduction algorism.

The invention generally relates to methods for manually calibrating imaging systems such as optical coherence tomography systems. In certain aspects, an imaging system displays an image showing a target and a reference item. A user looks at the image and indicates a point within the image near the reference item. A processer detects an actual location of the reference item within an area around the indicated point. The processer can use an expected location of the reference item with the detected actual location to calculate a calibration value and provide a calibrated image. In this way, a user can identify the actual location of the reference point and a processing algorithm can give precision to the actual location.

A phase-resolved heterodyne shearing interferometer has been developed for high-rate, whole field observations of transient surface motion. The sensor utilizes polarization multiplexing and multiple carrier frequencies to separate each segment of a shearing Mach-Zehnder interferometer. Post-processing routines have been developed to recombine the segments by extracting the scattered object phase from Doppler shifted intermediate carrier frequencies, providing quantitative relative phase changes and information to create variable shear, phase resolved shearographic fringe patterns without temporal or spatial phase shifting.

An apparatus and method for performing optical alignment between optical waveguide elements in manufacturing a surface mountable optical module, in which a plurality of optical waveguide elements are mounted on a surface of a mounting substrate, is disclosed. A controller performs recognition of the interference pattern included in the image information received from the camera, observes parallelism between the substrate support and the mounting substrate and between the mounting substrate and the optical waveguide element using the recognized pattern, generates a control signal to control the transport device according to the observed parallelism, and transmits the control signal to the transport device to perform control of the optical waveguide element.

An optical interferometer (1) is used to determine information about the position, gradient or motion of a surface of an object (2) at each of a plurality of points on the surface. An image is projected onto the surface of the object (2), such that, for each of the plurality of points, the intensity or spectrum of the projected image at that point depends on the determined information about the position, gradient or motion of the surface at that point.

Methods and systems to extract a spectrum of a hyperspectral interferogram, with innovative treatment of off-axis spectral correction and other features, which may be efficiently performed on-board a satellite.

A modular interferometric telescope including a base and an optical detector. A mounting beam has a first end, a second end, and a length, and is connected rotatably to the base at a point between the first and second end. The mounting beam is rotatable about a first axis extending in a direction of an object to be observed. A first light-collecting assembly is connected to the mounting beam proximal to the first end relative to the second end. The first light-collecting assembly directs light from the object to the optical detector. A second light-collecting assembly connected to the mounting beam is proximal to the second end relative to the first end. The second light-collecting assembly directs the light from the object to the optical detector. A first optical assembly is configured to receive the light from the object and direct the light to the optical detector.

A measuring apparatus, a measuring system, a measuring method, and a computer-readable non-transitory recording medium storing program code. The measuring apparatus and the measuring method include obtaining data indicating position coordinates of a surface of an object, and outputting information to associate amount information of the data belonging to at least one of a plurality of subspaces obtained by dividing a coordinate space with the plurality of subspaces when the amount information and the plurality of subspaces are displayed. The measuring system includes a measuring device and the measuring apparatus. The recording medium stores the program code for causing a computer to execute the measuring method.

A proposed password is decomposed into basic components to determine and score transitions between the basic components and create a password score that measures the strength of the proposed password based on rules, such as concatenation, insertion, and replacement. The proposed password is scored against all known words, such as when a user is first asked to create a password for an account or access. The proposed password can also be scored against one or more previous passwords for the user, such as when the user is asked to change the user's previous password, to determine similarity between the two passwords.