Complex data is obtained from OFDR backscatter measurements for an optical device under test (DUT). That complex scatter pattern data may be used along with a previously-determined fiber segment pattern to identify the fiber segment within the DUT, even when the DUT is an optical network DUT that includes multiple fibers coupled to perform one or more functions. In other non-limiting example applications, the OFDR scatter pattern data can be used to identify where in the DUT a loss occurred and ...

A system is described for measuring the distance to an object by comparing a first component (18) of a light pulse that is reflected off the object (14), with a second component (20) of the light pulse that passes along a reference path (26) of known length, which provides great accuracy with a relatively simple and rugged design. The reference path (26) can be changed in precise steps so that is has an equivalent length approximately equal to the path length of the light pulse component that is...

An agent and method for the prevention and treatment of toxicity caused by heavy metals such as depleted uranium, tungsten and nickel and metals such as iron, lead and copper. The agent is a chelating agent such as picolinic acid or derivatives thereof. The agent chelates and inactivates the metals which can be carcinogenic or poisonous. The agent can be administered to chelate excessive copper as a result of Wilson's disease. The agent can be administered orally or by other systemic routes such...

An optical measuring device generates a plurality of measured optical data from inspection of a thin film stack. The measured optical data group naturally into several domains. In turn the thin film parameters associated with the data fall into two categories: local and global. Local "genes" represent parameters that are associated with only one domain, while global genes represent parameters that are associated with multiple domains. A processor evolves models for the data associated with each ...

A laser transmitting and receiving speed and/or range detection device has coaxial internal beam directing and receiving paths for the transmitted and received (reflected) laser energy. A sight is provided having an optical combiner which presents a projected display of the detected speed or range of a target that may be observed by the operator while aiming the device at the target. A telephoto effect is utilized in the projection of the display onto the sight such that the operator need not di...

A fiber optic probe (100) provides in-vitro measurement for measuring fluid media containing bubbles and particulate matter where disturbances to fluid dynamics must be kept to a minimum. The probe transmits light to, and receives light from, the measured fluid media across a light-path gap (119) using two, separate fiber support tubes (107A, 107B) to protect the transmitting and receiving fibers and provide a rigid and resilient structure. Each support tube, containing one or more fibers, is be...

Apparatus for use with an operating microscope employed in observing the cornea of the human eye, for example in connection with cornea transplant operations. A plexiglass tube surrounds the objective of the microscope and is fed with light from a suitable source, so that an image of the circular illuminated lower end of the plexiglass tube is reflected by the cornea of the patient back into the microscope and is observed by the person using the microscope. The character and extent of distortion...

A visual acuity device measures the visual acuity of a patient's eye by directing a pulsating beam of light on the eye and detecting the resulting reflection. A primary pattern having a pattern formed by transparent and non-transparent portions is positioned in the optical path of the pulsating beam of light. A fixed pair of analyzer or secondary pattern is positioned in the optical path of the beam of light reflected from the patient'eye. One of these analyzer or secondary patterns has a patter...

An electromagnetic distance-measuring device wherein the time of transit of signals to and from a target is measured to determine a coarse scale distance to the target. An additional fine scale measurement of the distance to the target is provided by measuring the phase shift of the returned signal. The reflected energy, when received, triggers a counter to provide the coarse time measurement. The fine scale increment is provided by measuring the phase shift of the returned signal relative to a ...

A beam of coherent light is expanded and reparallelized by a single lens and a parabolic mirror. The beam then passes through the test region, which may be of any convenient size and impinges on a back surface mirror at 45 degrees. About 10 percent of the light is reflected from the front surface of the glass. This is slightly offset from the image reflected from the rear surface. Any refractive index gradients perpendicular to the direction of propagation then create fringes in the overlapping ...