A potential problem encountered in the implementation of symbolic substitution logic (SSL) is addressed in this paper. It is shown that in the case of intensity-coded data, the pattern recognizer in the architecture f...
详细信息
A novel technique for measuring the spectral properties of single-mode, semiconductor lasers for use in coherent optical communication systems is being explored. Unlike conventional 1inewidth/1ineshape measurements bo...
详细信息
This paper illustrates a technique to enhance the image resolution of an optical sensor beyond its Rayleigh diffraction limit. Calibration of the optics and suitable signal processing algorithms to solve the image con...
详细信息
The use of an antireflection (AR) coating which is a series of homogeneous layers whose index steps down from the substrate index to the index of air or a vacuum has been well described in the literature (1,2). These ...
详细信息
ISBN:
(纸本)0819402044
The use of an antireflection (AR) coating which is a series of homogeneous layers whose index steps down from the substrate index to the index of air or a vacuum has been well described in the literature (1,2). These are particularly attractive for high index substrates such as germanium, but are limited by the availability of appropriate real coating materials. The limiting factor is a lack of practical materials whose index is less than about 1.35. Another family of AR coatings which include one or more half wave layers is also known. The most common of these is the classical QHQ design. DeBell(3) reported on designs such as QHHHQ and QHHHHHQ where the H's are alternating high and low index layers. We have found that there is a family of inhomogeneous or "Rugate" index functions which can produce broadband AR coatings. These point to some general principles of AR coating design which have not been previously obvious from the literature. We describe these investigations and findings in graphical form. We discuss the concepts and understanding gained and examine the possibilities and limitations of the approach.
An automatic procedure of ordering fringes of the in-plane moire and the isochromatic patterns is proposed. The rotational mismatch is used in moire test and a bending beam is superimposed on the photoelastic specimen...
详细信息
A 19-element serial hill-climbing adaptive optical system is introduced. By using a 19-element deformable mirror,.a detector for sharpness of the focal spot and a dither control system, it can correct static and slowl...
详细信息
A relatively simple technique was devised to precisely align the components of a diagnostic instrument which recorded the first neutron images of imploding laser fusion targets. Alignment was achieved using a laser, a...
详细信息
An automated fiber alignment, fixing, and sealing process was developed for optoelectronic devices produced by BT&D Technologies. The products - transmitters, receivers, etc. - were developed simultaneously with t...
详细信息
By using a low power laser beam to pass through a beam splitter to illuminate the system which functions as a right angle reflector, the incident beam is reflected several times in the interval between the beam splitt...
详细信息
With the advent of new materials for solar cells, such as gallium arsenide, and of thinner materials used in larger flexible solar arrays, such as silicon and protective filter glasses, has come the need for improved ...
详细信息
ISBN:
(纸本)0819402044
With the advent of new materials for solar cells, such as gallium arsenide, and of thinner materials used in larger flexible solar arrays, such as silicon and protective filter glasses, has come the need for improved methods for the detection of cracks in the optical materials that compose the components of each. Four basic sensor designs have been conceived for use with visibly transmissive, as well as visibly opaque materials. Based upon their specific optical approach, the designs are called brightfield, quasi-brightfield, darkfield reflective and darkfield transmissive. All of these designs rely upon the fact that the crack's cleavage in the material provides a total or near total internal reflection boundary. The basic design simply involves an irradiation source, to which the material is transmissive, and a video camera, which is sensitive to the source's radiation transmitted into and out of the material. Two of the designs have only been demonstrated and await further development, when their need arrives. The other two designs have been developed for specific applications and have been integrated into the production environment at this time. They are proven, viable sensor designs. All of these designs facilitate the extrapolation of the basic crack detection process to future machine vision automation.
暂无评论