Papers by Keyword: Photoelectric Detection

Abstract: Aiming at the growing red tide, we designed a simply red tide predication device which is intended to measure the content of red tide alga in seawater. We make use of Chlorophyll A’s spectrum characteristic, which is in the red tide alga. Then combined with narrow spectrum of LED, high photon-electron efficiency and high response rate of PIN diode, different idea, we designed a circuit to amplify, acquire, process the optoelectronic signal and put the warning information on PC. We can know the accurate content of red tide alga in seawater in real time by monitoring the content of Chlorophyll A. This device has the advantages of high sensitivity, low cost and easy to operate .etc.

Abstract: For marine water pollution problems, According to the phenomenon that the refractive index of the seawater will change after been polluted .we designed a new fiber optical sensor, and completed a marine pollution monitoring automatic warning system with the sensor. One S (single mode)-M (multimode)-S-M-S structural optical fiber sensor based on the theory of M-Z Interference was made. Due to de refractive index of the fiber cladding will be affected by the environmental solution. We can determine the relationship between the movement of interference spectrum and the refractive index of the solution. With a center wavelength of 1553nm fiber Bragg grating and a coupler to obtain the change of the intensity of the light, then though the specific circuit, we can change the light intensity into the voltage values. Then enter the computer through the acquisition card, real-time reporting of environmental refractive index size, and according to the software set threshold alarms. The refractive index in the range of 1.330-1.390, the system of measurement error is less than 1%.

Abstract: Based on the noise analysis of the photoelectric detection circuit, error compensation aiming at photoelectric detection circuit has been performed by making use of interpolation method, look-up table method, adaptive neuro-fuzzy inference method, and surface fitting method, so as to improve the accuracy of photoelectric detection as well as reducing the system error. In the meanwhile, the error compensation effects of different methods are compared and analyzed. Finally, with the help of the MATLAB software, these effects are simulated using the measured data of photoelectric diode experimental platform as the sample data. The result of the simulation indicates that the adaptive neuro-fuzzy inference method can improve the detection accuracy better and its error compensation effect is also better than that of interpolation method, look-up table method, and surface fitting method, when they are under the same conditions.

Abstract: Aiming at the burst point time measuring device cannot timely show the burst point time measurement situation, a new measuring system was designed. The pulse signal when the ammo was outing of the muzzle and exploding was detected by APD, the light pulse was converted to voltage pulse through an amplifying circuit. The timing display module was designed, the timing circuit got the voltage pulse and timing, and then the burst point time would show on LCD. All the photoelectric detector module was fixed with the special mechanical properties. The system could increase the maximum detection distance effectively, improve its detecting precision, and display the burst point time immediately. With the simulation experiment, the system had no failing to get the burst point time, and owned a stable performance. This design can provide a reference for the optimization and improvement of the burst point time measuring device.

Abstract: The test of complete blood cells plays a significant role in diagnosis and treatment of diseases. In order to take an immediate quantitatively measurement of red blood cells, platelets, lymphocytes, monocytes and granulocytes, as well as to realize the binary classification of white blood cells, we design a novel blood cell analysis system based on capillary centrifugation and stratification technology. Blue and red LED array are adopted as light sources, and one-dimensional images of the capillary can be got from the color linear CCD. By further analysis can we obtain the final nine parameters. In the paper, we mainly focus on description of the system’s working principle and the general design. Experimental results show that our system is of high accuracy and good repeatability.

Abstract: Laser differential confocal sensor (LDCS) is a high precision and high integrated measurement system. In order to meet the demand of the LDCS, a novel implementation method of high precision conditioning circuit is studied. This circuit consists of photoelectric conversion, secondary amplification and signal operation. The photoelectric conversion is designed to detect the light intensity signal and transform it into a voltage signal. In order to adapt the test for different samples, the magnification is adjustable in secondary amplification unit. The two-way light intensity signals of the LDCS are differentially subtracted in signal operation unit. The noise characteristics of the photoelectric conversion unit were analyzed and the methods for decreasing noise were presented. The experimental results show that signal to noise ratio (SNR) of the conditioning circuit is better than 1160 and the sensitivity of LDCS reaches 2.168V/μm, which has the advantages of low noise, high stability and high integration and can widely used in many kinds of high precision photoelectric measurement systems.

Abstract: A novel analytical instrument for quantitative testing colloidal gold strips is developed based on the principle of photoelectric detection. The test-strip analytical instrument uses green LEDs as the emitting light source and a photodiode as the receiving device for obtaining reflected light, and utilizes a step motor to drive detection system for scanning the examining areas. Modulation technique for light source signals and demodulation technique for receipt signals are used to eliminate the interference of the background noise. The test results indicate the system has high detection veracity rates with detecting errors less than 1%, and good detection stability with coefficient variables less than 2%.

Abstract: To quantitatively detect the on-site test of the content of clenbuterol in pork, a photoelectric apparatus for the colloidal gold test to detect clenbuterol was developed based on green LED and linear CCD. This design method could realize a semi-quantitative analysis of clenbuterol concentrations ranging from 0 to 1 ng/ml. Such an apparatus could promote an integrated approach to the management of the community food safety

Abstract: To improve the detection performance of dynamic object tracking system that cannot work normally at night, the infrared detection technology is put forward to design and study its detection tracking system. According to the characteristic that projectile can produce heat radiant energy when it flying, the surface projectile was divided into small unit area independently to calculate its infrared radiation energy, its heat radiation temperature equations were established, the method of four-order runge-kuta was applied to analyze and calculate temperature parameter. The relation between atmospheric attenuation and detection performance was analyzed in dynamic object tracking system. Through calculating and analyzing, the theory of infrared radiation technology meets the need of dynamic object tracking system.

Abstract: Manipulator cleared the surface of fluid pipelines is the necessary pipeline engineering construction equipment. Developing an advanced automatic robotic pipeline construction and making it industry can satisfy the needs of pipeline engineering in the country improve mechanization level and work efficiency and reduce labor intensity. According to the actual situation, the paper conform the principle of the robotic work. Analysis the work process of the manipulator, the design gives the optical detection system. This manipulator adopts automatic rotary and feeding, intelligent control and automatic detecting effects and feedback. The movement of the manipulator can been regulated and controlled timely by the photoelectric detection device of the manipulator. It is suitable for cleaning the surface of various pipelines in the complex condition field. This paper studies the revolution，feeding and feedback of the pipeline construction of the manipulator. Finally, study and design a stable running, flexible movement, accurate positioning, the effect is automatically detected and reliable intelligent robot which compatible with the subject. This manipulator can well meet the requirements of operation.