摘要:
A method and apparatus for moire ray deflection mapping for determining properties of an object in which a point source of light producing a diverging beam of direct light is passed through a first optical system including the object to be examined, which system retraces the light in the form of a converging beam of reflected light from the examined object back towards the point source. The converging beam of reflected light is intercepted before reaching the point source and is passed through a second optical system which collimates the beam of reflected light. The collimated beam is then directed through first and second gratings at a preselected angular orientation with respect to each other to produce moire fringe patterns providing an indication of the properties of the examined object. An important advantage in the above novel method is that the same setup can be used for measurements of both phase objects and specular surfaces.
摘要:
A frequency marker system for indicating the wavelength of light rays, said system comprising: means for collimating said light rays, first and second grating means aligned with at least a portion of said collimated light waves and separated by a distance .DELTA. for providing Moire patterns, means for determining the changes in wavelengths responsive to changes in frequency by determining deflections of the Moire patterns.
摘要:
An automatic traffic monitoring system for enforcing traffic laws and regulations and for general purpose traffic monitoring includes a novel passive road sensor that accurately detects the kinematics of moving vehicles. A passive road sensor includes a detector protected in an enclosure, which is embedded in a road opening, is in a continuous listening mode. When the wheels of a passing vehicle come in contact with either the road opening, the enclosure, or both, the resulting mechanical impact generates a disturbance that triggers the detector. A processor unit of the automatic traffic monitoring system records the signal sensed by the detector and analyzes its temporal characteristics to determine the precise time of impact.
摘要:
A method of encoding an optical image comprises: converting the optical iamge to an image grid comprised of an image matrix of pixels each having at least two possible intensity values; providing a master grid comprised of a master matrix of pixels each having at least two possible intensity values; and transmitting, for each pixel location of the image matrix, a pixel intensity value representing the intensity value of the master matrix at the corresponding location, its complement, or a random intensity value, depending on the intensity value of the pixel in the image matrix at the corresponding location. Also described is an apparatus for carrying out the above encoding method.
摘要:
A system and method for determining modulation transfer function (MTF) of an optical element or system employs a moire deflectometer. A selected central portion of monochromatic light is directed to the first grating of the moire deflectometer through or from the optical system, resulting in a moire pattern in which the contrast along an axis incident to the moire fringes is indicative of the MTF of the optical system for a particular spatial frequency, which is dependent on the spacing between the gratings of the moire deflectometer.
摘要:
A process for the transmission and/or storage of information defined in digital form comprises transforming the clear file, containing said information, to graphic equivalent form, transmitting and/or storing the same in such graphic-equivalent form and bringing it back to digital form.
摘要:
A file encryption method is provided which includes the steps of encrypting the text of the message to be sent, concatenating the encrypted text together with a password to the end of a decryption application to produce a combined file and converting the combined file to an electronic mail format. The file encryption method further includes the steps of transmitting and receiving the converted combined file, reconverting the converted combined file to its previous format and executing the combined file thereby to operate the decryption application on the encrypted text and thereby to produce the text of the message.
摘要:
The invention provides a device to be connected to a telephone line and, alternatively, to a telephone set or a printer. The device comprises a switch device for automatically operating the one or the other connection according to the signals received through the line. When modulated telefax signals are received, they are transmitted to a modem which transforms the signals to sequential digital signals, these are stored in a buffer memory, at least to an extent corresponding to a line of print, and they are then transformed by a microcircuit to matrix digital signals, which are transferred to the printer. Fax messages transmitted through the telephone line are thus automatically printed out. The invention also provides a printer, which incorporates a modem, a buffer memory and microcircuit for performing the aforesaid operations, through which the printer may selectively be connected to a telephone line, and which may be by-passed to connect the printer to a computer. The invention also provides a message receiving system, which comprises a printer and a device for selectively connecting the system to a computer or to an interface interposed between the printer and a telephone line, which comprises a modem, a buffer memory a and microprocessor for converting sequential digital information to matrix digital information.
摘要:
A Moire system for linear measurement of an unknown distance defined by two surfaces, a collimated light source, a first grating between light source and the surfaces, a second grating positioned to receive collimated light from the surfaces after the light has reached the surfaces from the first grating, the first and second gratings being rotated relative to each other by a small angle .theta., a screen located after the second grating for receiving Moire patterns caused by the first and second gratings, and a mechanism for shifting the patterns as a function of the unknown distance whereby measurements of the amount of shifting is determinative of the unknown distance.
摘要:
Equipment and method for mapping an object using moire deflectometry wherein collimated radiation deflected from the object is used to generate a moire pattern and wherein by measuring linear deflections in the pattern, variations in characteristics of the object is determined.