Study Of Theory And Technology Of Colorimeter Based On Optical Fiber Miniature F-P Cavity

As is known to all, with development of science and technology, it is more and more closelypaid attention to the use of the chroma. This paper proclaims the development ofchromascope at home and abroad. At present, measuring device mainly can be separated intotwo categories. One is the device that based on quantitative measuring. Its survey precisionis high, but for it has light splitting unit and big volume, it is very inconvenient to use. Theother use tristimulus values light filter for measurement. It has small volume and is easy tocarry. Still, its survey precision is low. So developing the chromascope that based onquantitative measuring and easy to carry is of great importance.In order to promote better understanding design and manufacture of chromascope, it isnecessary to summarize the relative theory in color measuring. The relative physical quantityof color measuring contain the theory of color, the concept of colorimetry, the concept ofphotometry, the reference criterion, the uniform color space, the chromatic aberration and soon. Generally speaking, there are two methods for color measuring.The new chromascope is designed based on the theory of optical fiber miniature F-Pcavity. In order to explain the interference character of optical fiber miniature F-P cavity, themultibeam interference and F-P cavity theory are illustrated in this paper. The multibeaminterference is the coherent superposition of a batch same-frequency lights that are parallel toeach other and have same optical path. The interference extremum and light distribution arealso researched. If change the length of F-P cavity continuously and record the interferenceintension, it will get the spectroscopic data after Fourier transform.So the work theory of chromascope based on optical fiber miniature F-P cavity is asfollow: each optical fiber corresponds to an F-P cavity with different cavity length, light gothrough optical fiber and reach the F-P cavity, take CCD as interference light intensity detection of F-P cavity. Then transmit the collected light intensity data to the microprocessor.After some processing, it will get the chrominance information. In order to design the bestoptical fiber miniature F-P cavity, analyses the four cavities character. It also researchesselectively on side surface coating film method and optimizes the optical fiber side surfacereflectivity.According to the analysis, it is shown that optical fiber, selection of detector and theprocessing method of V miniature groove are the key parts of instrument. The optical selectthe single mode fiber. The detector wavelength coverage can be in the visible light. Theprocessing method of V miniature groove mainly contain: chemical cleaning, thermal oxide,chemical vapor deposition, adhesives and etching process. Control system mainly used to getthe testing signal, fast handling of the testing signal and so on.System assemble is also an important part. Because the optical fiber diameter is verysmall, the whole assemble is done under the stereo-microscope. Firstly, lay the fixed base onthe work bean and put the optical fiber in the V miniature groove using fifth dimensionprecise adjustable frame. For the high degree of freedom is not limit, can put a glass on theside of optical fiber, make it has same high. It also takes feedback method to make thedistance of F-P cavity.After the design, the mainly task is the system demarcate. Experiment prove that thischromascope device has high detecting precision and can be used in many field.