초록 ▼

The microcomputer controlled image processor receives an interference pattern of samples of pairs of transmitted laser beams from a charge couple device (CCD) camera. The present invention then calculates an optical path difference between each pair of beams using: an analog amplifier, an analog-to-

The microcomputer controlled image processor receives an interference pattern of samples of pairs of transmitted laser beams from a charge couple device (CCD) camera. The present invention then calculates an optical path difference between each pair of beams using: an analog amplifier, an analog-to-digital (A/D) converter, a multiple accumulator controller, a programmable read-only-memory (PROM), a microcomputer, and a random access memory (RAM). The analog amplifier and A/D converter amplify and convert to digital the interference pattern received from the CCD camera. The multiple accumulator controller (MAC) receives the digital camera signal from the A/D converter, and adds correction factors for the non-linearities in the CCD camera. The PROM stores these correction factors, and supplies them to the multiple accumulator controller when needed. The random access memory receives and stores the corrected data from the multiple accumulator controller, and supplies the data to the microcomputer. The microcomputer receives the corrected digital interference pattern from the random access memory, and applies two algorithms to the data to yield estimates of the optical path difference between the two sampled laser beams. The optical path difference (OPD) is a measure of adjustment in the optical path lengths of the two sampled laser beams. When this OPD value is supplied to the laser transmitter, a correcting means can adjust the length of the optical paths of one or both of the sampled laser beams to bring them in phase with each other.

대표청구항 ▼

In combination with a charged coupled device camera which receives samples of two signals and generates an interference pattern between the two signals, a microcomputer controlled image processor which receives said interference pattern from said charge coupled device camera and calculates therefrom

In combination with a charged coupled device camera which receives samples of two signals and generates an interference pattern between the two signals, a microcomputer controlled image processor which receives said interference pattern from said charge coupled device camera and calculates therefrom an optical path difference between said two signals, said optical path difference being a measure of distance which would bring the two signals in phase to each other if applied to the length of their optical paths, said microcomputer controlled image processor comprising: an analog amplifier producing an output signal by receiving and amplifying said interference pattern from said charge coupled device camera; an analog-to-digital converter producing an output signal by receiving and converting into a digital signal said output signal of said analog amplifier; a memory means receiving, storing and outputting data signals, including those received from said analog-to-digital converter; a means for conducting signals from the analog-to-digital converter to the memory means; a data processing means receiving said output signals from said memory means and calculating therefrom said optical path difference using a linear algorithm, said linear algorithm establishing a quantity created from a difference in measures of adjacent sidelobes on left and right sides of a central peak in said interference pattern, said quantity being normalized by dividing said difference by a sum of said measures, and wherein said data procesing means comprises a computer which uses the following equation as said linear algorithm: [Figure] OPD is said optical path difference whose quantity is given in terms of ll