Abstract:
An optical arrangement comprising a multi-mode fiber (16) for carrying single mode laser light (12); a randomizer (18) for randomizing spatial modes supported by the fiber and means for averaging, out the randomized spatial modes to recover the single spatial mode.
Abstract:
The present invention is directed to solving the problems associated with the detection of surface defects on metal bars as well as the problems associated with applying metal flat inspection systems to metal bars for non-destructive surface defects detection. A specially designed imaging system, which is comprised of a computing unit, line lights and high data rate line scan cameras, is developed for the aforementioned purpose. The target application is the metal bars (1) that have a circumference/cross-section-area ratio equal to or smaller than 4.25 when the cross section area is unity for the given shape, (2) whose cross-sections are round, oval, or in the shape of a polygon, and (3) are manufactured by mechanically cross-section reduction processes. The said metal can be steel, stainless steel, aluminum, copper, bronze, titanium, nickel, and so forth, and/or their alloys. The said metal bars can be at the temperature when they are being manufactured. A removable cassette includes various mirrors. A protection tube isolates the moving metal bar from the line light assembly and image acquisition camera. A contaminant reduction mechanism applies a vacuum to remove airborne contaminants.
Abstract:
The present invention is directed to solving the problems associated with the detection of surface defects on metal bars as well as the problems associated with applying metal flat inspection systems to metal bars for non-destructive surface defects detection. A specially designed imaging system, which is comprised of a computing unit, line lights and high data rate line scan cameras, is developed for the aforementioned purpose. The target application is the metal bars (1) that have a circumference/cross-section-area ratio equal to or smaller than 4.25 when the cross section area is unity for the given shape, (2) whose cross-sections are round, oval, or in the shape of a polygon, and (3) are manufactured by mechanically cross-section reduction processes. The said metal can be steel, stainless steel, aluminum, copper, bronze, titanium, nickel, and so forth, and/or their alloys. The said metal bars can be at the temperature when they are being manufactured.
Abstract:
A gas composition monitoring arrangement for a module 2 used in a solid oxide fuel cell comprises provision of an optically transparent window 4 in the end of a gas flow channel 3 formed in that module 2. Thus, the window 4 allows passive and active optical gas analysis of the gas flow through the channel in situ without the necessity as with previous systems of drawing a proportion of that gas flow away from the module 2 and therefore fuel cell for appropriate analysis. In such circumstances, actual in situ gas composition determination is achieved rather than a determination which may be distorted through the transfer regime to a previous remote gas analysis apparatus.
Abstract:
A compact handy type inspection instrument is provided for conducting readily nondestructive inspection of an inspection object in any working site. The inspection instrument comprises a spectroscope assembly containing an optical fiber-arranging member for arranging and holding a light-outputting end of an optical fiber bundle to be flat in a uniform layer thickness, a packaged compact spectroscope which is enclosed in a package having a slit-shaped light inlet window on a side confronting the rectilinear light-outputting end of the optical fiber-arranging member and is constituted of linear type continuous variable interference filter, a microlens array, and a linear type silicon array sensor assembled in the named order from the side of the light inlet window toward the opposite side, and a positioning device for positioning the rectilinear light-outputting end of the optical fiber bundle to fit to the light input window; and a detection head; incorporated together into a main body casing.
Abstract:
Fiber-optic-based systems and methods for monitoring physical parameters using a remotely deployed circulator are disclosed. In a preferred embodiment the circulator is remotely deployed with respect to an optical source/detector and coupled thereto by two dedicated fiber optical cables: a forward line for passing light from the source through the circulator to fiber-optic-based sensors, and a return line for passing light reflected from the sensors through the circulator back to the detector. By using separate forward and return lines in conjunction with the circulator, backscattering phenomenon experienced on the forward line will not interfere with the reflected light signals coming from the sensors. The circulator, and hence the sensors, may therefore be remotely deployed from the source/detector present at a monitoring station, greatly expanding distances which optical sensing systems can span.
Abstract:
A gas sensor using optical fiber technology to measure gas concentration in a test volume. In one embodiment, the sensor incorporates a gas enriching polymer which absorbs and concentrates carbon dioxide (CO.sub.2) from the test volume surrounding the sensor. The polymer is wrapped around the core of an optical fiber which guides radiation with first selected wavelengths to the polymer. The radiation propagates into the polymer and reacts with the carbon dioxide in the polymer. Determination of CO.sub.2 concentration in the test volume is made by measuring the amount of attenuation of the radiation after reacting with the carbon dioxide in the polymer. In another embodiment, the polymer is capable of absorbing oxygen from the test volume and oxygen concentration is measured using fluorescence quenching. Being added to the polymer, a special dye reacts to radiation having selected wavelengths and produces a second radiation with wavelengths which are different from the selected wavelengths and which are absorbed by oxygen. Determination of oxygen concentration in the test volume is made by measuring the degree of attenuation of the second radiation after reacting with the oxygen in the polymer.
Abstract:
An optical fiber probe for attenuated total reflectance measurements comprises a tubular body within which pass input and output optical fibers. The optical fibers are mounted within the body so that radiation emitted from the end of one of the optical fibers can pass through the optical system of the probe and be reflected back and focused on to the end of the other optical fiber for transmission back to a spectrophotometer. The optical system includes an attenuated total reflectance element, preferably of zinc selenide, which has a cylindrical body having at one end two perpendicular cut-away surfaces to form a roof mirror and at the other end a convex surface which acts to focus the radiation on to the end of the output optical fiber. The material to be tested is allowed to come into contact with the surfaces of the roof mirror, and then radiation is sent through the element and is totally internally reflected within it. Sealing around the element is effected by means of an O ring seal which extends around the element's cylindrical surface. Since there are no internal reflections from this surface, the spectrum of the O ring is not picked up.
Abstract:
Radiant energy is transmitted to a probe element including an interior conical reflecting surface and a fluid sample chamber. Portions of the light which have been transmitted, partially attenuated, or scattered by a fluid sample in the sample chamber are directed by at least a portion of the interior conical reflecting surface to means for collecting the transmitted, partially attenuated, or scattered light. A stilling valve incorporated into the probe element enables elimination of entrained gas bubbles from the chamber. A specific application of the probe is disclosed in which a titration analyzer is combined with electro-optic signal conversion and processing circuits and a probe according to the invention to provide titration colorimetric endpoint determination in measuring the free fatty acid content of a fluid such as a edible oil or fat.
Abstract:
A versatile optical analysis system comprising a spectrophotometer having a collimated radiation source, an output port for the radiation, an input port for external radiation, a detector, and means for processing electrical signals representative of radiation from a sample to be analyzed. The system also comprises one or more remote terminals where the sample is located, and novel radiation piping means for selectively piping radiation from the spectrophotometer to the remote terminal or vice versa. Novel remote terminals are also described for carrying out diffuse reflection, external reflection, or emission analysis.