Nanyang Technological University

Ngee Ann Polytechnic

Anand Krishna Asundi

Lei Huang

Subodh Gautam Mhaisalkar

Vijay Raj Singh

Anish Priyadarshi

Chi Seng Ng

Oi Choo Chee

Hoe Jyh Koh

Chao Zuo

Weijuan Qu

A transport-of-intensity imaging system is proposed which incorporates a control element positioned in an optical relay system, such as a 4f optical relay system, between a microscope system for generating an image of a specimen, and an image capturing device. The control element is located with an optical relay system, and is controllable to vary the focal plane without changing the spacing of the specimen and the image capturing device. In one form the control element is an electronically tunable lens (ETL). In another form, the control element is a spatial light modulator (SLM). The arrangement may include a beam splitter arrangement for generating a plurality of beams, which are not all subject to the same control element, such that multiple images with different focal planes are captured from the respective beams.

Methods and systems for transport-of-intensity imaging

An apparatus for 3D surface measurement of a target surface, the apparatus comprising: a first projector configured to project a fringe pattern onto the target surface; a second projector configured to project a fringe pattern onto the target surface; a first camera configured to capture the fringe patterns projected by the first projector and the second projector; a second camera configured to capture the fringe patterns projected by the first projector and the second projector; and a computer configured to perform fringe pattern processing of the fringe patterns captured by the first camera and the second camera and to perform data stitching and merging to obtain a 3D surface reconstruction.

Apparatus and method for 3D surface measurement

An optical configuration for a digital holographic microscope and a method for digital holographic microscopy are presented. In one embodiment, digital off-axis holograms are obtained using a cube beam splitter () to both split and combine a diverging spherical wavefront emerging from a microscope objective (). When a plane numerical reference wavefront is used for the reconstruction of the recorded digital hologram, the phase curvature introduced by the microscope objective () together with the illuminating wave to the object wave can be physically compensated.

Digital holographic microscopy

A holographic microscope comprising a source configured to provide a diverging beam of radiation, a beam splitter configured to direct a first portion of the diverging beam towards an object and a second portion of the diverging beam towards a reflector, the beam splitter being further configured to direct an object beam from the object and a reference beam from the reflector towards a transducer, and the transducer being configured to provide a signal indicative of the interference pattern of the object beam and the reference beam incident on the transducer. A method of digital holography is also disclosed.

In-line digital holographic microscope and a method of in-line digital holographic microscopy

A moir&#xe9; interferometric strain sensor for detecting strain on a specimen, a diffraction grating being on the specimen, the strain sensor including an array of a plurality of microlenses for receiving at least one reflected beam of at least one incident beam upon the specimen; and a detector array at a focal plane of the array of a plurality of microlenses.

Growing community of inventors

Singapore, Singapore

Anand Krishna Asundi