A system and method for generating, enhancing, and detecting the amplitude and phase modulation of a laser under a condition of self-mixing is provided. The system may comprise a laser and a detector to extract the characteristic self-mix signal, which is then interpreted using algorithms implemented in hardware or software. In the case of the laser being a Vertical Cavity Surface Emitting laser (VCSEL), the output signal can be detected by monitoring the surface light emission by means of a beam splitter, or in some embodiments as emission from the bottom surface of the laser. In some embodiments, the system may further comprise a wavelength filter such as an etalon in the signal path.

An optical coherence tomography device includes a base with a detection end and a mounting end, a movable base and a second drive mechanism. An optical imaging catheter is pivotally connected to the detection end. The optical imaging catheter is provided with an imaging end and a connecting end. The connecting end is detachably connected to the detection end, and the connecting end is provided with a first connecting part. The movable base is provided with a fiber optic rotary joint, a hollow shaft and a first drive mechanism. The end of the hollow shaft is provided with a second connecting part. When the movable base moves toward the detection end, the second connecting part is configured to be connected to the first connecting part so that the optical imaging catheter is coupled with the hollow shaft. The device is capable of manually or automatically connecting the optical imaging catheter.

A system for optical coherence tomography includes a source of optical radiation, an optical fiber, and a graded index fiber attached to a distal end of the optical fiber. The optical fiber and the graded index fiber are together configured to provide a common path for optical radiation reflected from a reference interface at a distal end of the graded index fiber and from a target.

A method, system and apparatus are provided in accordance with example embodiments for optically measuring workpiece features, and more particularly, to optically measure internal surfaces of round bores and countersinks. Methods include: advancing a probe through a bore and a countersink; and measuring dimensions of the bore and the countersink using a bore laser cone and a countersink laser cone, where the bore laser cone is received at the bore camera lens in response to reflecting from a first reflective surface of the probe to a surface of the bore to a third reflective surface of the probe and to the bore camera lens, and where the countersink laser cone is received at the countersink camera lens in response to the countersink laser cone reflecting from a second reflective surface of the probe to a surface of the countersink to a countersink beam reflector and to the countersink camera lens.

A device for cancer screening and triage using an optical coherence tomography (OCT) imaging system integrated with optical imaging probe is provided. Endoscopic OCT images are generated using the OCT system having a helical probe. The images are further analyzed to generate a depth resolved intensity OCT signal to classify the region of tissue into variable grades of dysplasia to guide the physician's biopsy or resection.

Provided is a shape measurement system in order to perform three-dimensional measurement corresponding to a measurement object having various shapes, which includes a measurement probe, a probe tip, and a processor. The probe tip includes an optical element that is configured to irradiate an object with measurement light and a cylindrical unit that is configured to lock the optical element. The processor is configured to calculate an optical path length from the optical element to an object based on reflected light of the measurement light with which the object is irradiated; and calculate a three-dimensional shape of the object based on the input information and the optical path length.

An endoscope system (200, 300) for imaging an interior of a patient (180) comprises an endoscope tube (210, 310), an imaging unit (350) for imaging the interior of the patient, wherein the imaging unit is at least partially located inside the endoscope tube, and an optical coherence tomography unit (360), wherein said imaging unit (350) is distinct from the OCT unit (360), and wherein a sample arm (360c) of the OCT unit is at least partially located inside the endoscope tube.

The present disclosure provides a method of evaluating a mechanical property of a material using a device for evaluating the mechanical property of the material. The device comprises a sensing layer having a thickness, a sensing surface and an opposite surface. The sensing layer is deformable such that, when the sensing surface is in direct or indirect contact with the material and a suitable load is applied across both the sensing layer and at least a portion of the material, the sensing layer deforms and the sensing surface moves relative to the opposite surface. The device also comprises a source of electromagnetic radiation in optical communication with the sensing layer. The source is arranged for generating electromagnetic radiation having a coherence length that is of the same order of magnitude as the thickness of the sensing layer or longer than the thickness of the sensing layer. Further, the device comprises a detector for detecting the electromagnetic radiation and being in optical communication with the sensing layer and arranged for receiving the electromagnetic radiation after the electromagnetic radiation is reflected at the interface at the sensing surface of the sensing layer. The method comprises positioning the sensing layer relative to the material such that the sensing surface is in direct or indirect contact with the material. Further, the method comprises applying the suitable load across both the sensing layer and at least a portion of the material whereby the sensing layer deforms and the interface at the sensing surface moves relative to a condition in which no load is applied. The method also comprises directing the electromagnetic radiation to the interface at the sensing surface such that at least a portion of the electromagnetic radiation is reflected at the interface at whereby a first signal is generated and directing electromagnetic radiation along a second optical pathlength to generate a second signal. Further, the method comprises allowing the first signal and the second signal to interfere and detecting an intensity associated with a resultant interference signal using the detector; and determining information concerning the mechanical property of the material from the detected intensity of the interference signal.

Multichannel optical coherence systems and methods involving optical coherence tomography (OCT) subsystems are operably and respectively connected to optical fibers of a multichannel optical probe, such that each optical fiber forms at least a distal portion of a sample beam path of a respective OCT subsystem. The optical fibers are in optical communication with distal optical elements such that external beam paths associated therewith are directed towards a common spatial region external to the housing. Image processing computer hardware is employed to process OCT signals obtained from the plurality of OCT subsystems to generate an OCT image dataset comprising a plurality of OCT A-scans and process the OCT image dataset to generate volumetric image data based on known positions and orientations of the external beam paths associated with the OCT subsystems.

A calibration configuration for a chromatic range sensor (CRS) optical probe of a coordinate measurement machine (CMM) includes a cylindrical calibration object and a spherical calibration object. The cylindrical calibration object includes at least a first nominally cylindrical calibration surface having a central axis that extends along a Z direction that is intended to be aligned approximately parallel to a rotation axis of the CRS optical probe. The spherical calibration object includes a nominally spherical calibration surface having a first plurality of surface portions. The CMM is operated to obtain radial distance measurements and determine cylindrical calibration data using radial distance measurements of the cylindrical calibration object and to determine spherical calibration data using radial distance measurements of the spherical calibration object.