| According to the requirement of real time and continue detection of sludge concentration in sewage decontamination industry, this paper designed a kind of sensor and detection instrument to detect activated sludge concentration. Consider of the composition, characteristic, the rate of permeation light, color of the activated sludge, using near infrared diode as lamp-house, photosensitive diode as light detector. The lamp-house drive is alternating modulation signal. This technology can overcome the direct current disturbance of nature light, sludge color, bleb etc. The structure of dual lamp-house and dual received diode can overcome the disturbance when the sensor is stained with sludge.Using C51 advanced computer language design the software of the single-chip. The higher efficiency compiler is KeilCSl developed by Keil company German. The compiler can overcome many disadvantages of previous such as low efficiency, long code, low execution speed. It also overcome many disadvantage of using crabbed assemble language, and increase work efficiency in a large extent.The hardware structure of sludge concentration detection instrument is "two-chip". It mainly composed by CPU and CPLD. Data-processing is accomplished by CPU. The control of A/D and dynamic scan display is accomplished by CPLD. Compared with previous system controlled by single-chip, this kind of structure has many advantages, such as high speed, strong reliability, hardware upgradeable, etc.Using EDA tools to design periphery circuit of single-chip. Reduced the use of SSI and MSI. Made the hardware design like software design.
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