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Portable spectrophotometer Circuit Design

Author: FanJie
Tutor: YanChangXiang
School: Graduate Schoo,Chinese Academy of Sciences
Course: Optical Engineering
Keywords: Spectrophotometer ARM Pulsed xenon lamp Photodiode array
CLC: TH744
Type: Master's thesis
Year: 2010
Downloads: 41
Quote: 0
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Abstract

The need to maintain color consistency of the occasion , in order to avoid losses caused by subtle color , scientific , quantitative to describe a variety of different colors is very important. Existing domestic self-developed color measurement products are mainly colorimeter and spectrophotometer -based desktop , colorimeter excellent source can not be accurately measured tristimulus values ??and chromaticity coordinates, is not suitable for measurement requirements are very right occasion ; benchtop bulky , costly and not easy to carry, is not conducive to the color of the field measurements . In order to achieve high accuracy, fast , low-cost color measurement , this paper designed a portable color based on spectrophotometric detection equipment operating circuit. Based on the development of domestic and color measurement instruments and characteristics were summarized and analyzed , starting from the color theory , color detection instrument for the working principle and design elements, each module as well as photoelectric sensors work process performance analysis and research , through needs analysis and device selection , designed to LPC2478 chip as the core circuitry . The system first by controlling the MAX8622 to charge the capacitor , and then control the pulsed xenon lamp exposure , the realization of the measured object illumination , and then by the S4114-46Q silicon photodiode array and multi-channel analog switch ADG738 generated by the optical system spectral spectrum of 40 channels time division signal acquisition, and the collected in the weak current signal through I / V conversion and amplification to obtain the spectral signal corresponding to the voltage signal , this signal by A / D conversion and data processing to obtain color information of the measured object , and test results through the LCD display output. Furthermore , in order to facilitate data transmission and management, but also were designed two RS-232 and USB communication interfaces . The results show that this design has a measurement speed , small size, low power consumption, etc. . System power is lower than 5W; single measurement time is 1.5s; measured twice at intervals of 3s; This design uses 4 lithium batteries , can be more than 1000 measurements. The realization of various functions for the subsequent integration of the optical system laid the foundation , basically reached the practical requirements , suitable for textile, printing and dyeing and other areas requiring on-site measurements .

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CLC: > Industrial Technology > Machinery and Instrument Industry > Instruments, meters > Optical instruments > Physical optical instruments
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