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 Posted: Fri 4:58, 10 Dec 2010 Post subject: ugg prezzo Portable high-precision photoelectric c |
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Portable high-precision photoelectric colorimeter soil of nutrients
Since the maximum absorption wavelength, such as the P205 on the soil with the maximum absorption wavelength 650llm etc., should be the instrument functions with different wavelengths, of course, the analysis of soil testing instrument of raising Figure 4 rounds of sub-species are filter limited, usually only a small number of wavelengths used. Monochromatic light generated during the design may have two options: one is the use of grating method to generate monochromatic light, a color filter is generated using monochromatic light, taking into account the specific equipment requirements and cost, after A solution is economic. To extend the measurement range, a specially designed filter wheel, as shown in Figure 4. Installed in a wheel 6 different wavelengths filter when using a different wavelength, can be manually rotated filter wheel to select. 3 Experiment and analysis 3.1 Instrument precision instrument design is completed the soil nutrients, temperature and other tests, with the print test results and quick operation and use of indicators such as portability requirements, soil testing and fertilization techniques to meet the country to promote the appropriate norms and standards. Instrument stability, reproducibility, linearity and sensitivity specifications shown in Table 1. Table 1 Instrument stability, repeatability, linearity and sensitivity of the data tables from the Henan Province of the prototype test certificates and Technical Supervision (the amount of recognized words Z0852 Henan number) of the inspection reports. Measurement of January 2005 3.2 photoelectric colorimeter measurement of soil Tester comprehensive error rate testing program integrated several key errors ... such as soil testing, shown in Table 2. Table 2 portable photoelectric colorimeter soil nutrient test items primarily test the speed and error that the nitrate, ammonium nitrogen, phosphorus and potassium were measured 4 kinds of projects simultaneously,[link widoczny dla zalogowanych], sharing time, 50min. Test shows that photoelectric colorimeter portable soil testing laboratory to meet the precision requirements of routine analysis, the use of filter photoelectric colorimeter, simplified structure, improved maintainability, its stability, repeatability and linearity error to meet or exceed Class II test grating spectrophotometer national rules; full account of the use of the rural environment, the characteristics of Chinese characters using the LCD display, auto zero, auto-light intensity, fault diagnosis, minimizing the requirement for operators . 4 Conclusion portable photoelectric colorimeter soil nutrients fully taken into account to meet the actual needs of agricultural production, focusing on portable, low cost and high stability. Constant power technology with a light source and light intensity automatically adjusts the technology that enables different wavelengths of light intensity automatically adjusted according to the best state, the stability of the instrument than the national test rules of order value of about one order of magnitude; using automatic correction of linear absorption technologies, non-monochromatic light caused the error correction, the portable test photoelectric colorimeter spectrophotometer linearity to linear effect; instrument calibration model the internal embedded temperature, the temperature range up to a 2O ~ 4O ℃, the linearity error test than the state rules of order value reduced by half; it the first time the fertilization expert system embedded in photoelectric colorimeter to improve the intelligence level of the instrument, apparatus, external dimensions 210mln × 160mln × 70mln, weight 1.5kg, low price, very suitable for rural grassroots units. [References [1] Chen Lun Ting, Li Ren Gang. Principles and practice of agricultural fertilizer [M]. Beijing: Agriculture Press, 1989.15o ~ 289. [2] Huang Chiu wish. Fertilization and foliar fertilizer [M]. Beijing: Golden Shield Press ,[link widoczny dla zalogowanych],1997.53-300. [3] Yinghua,[link widoczny dla zalogowanych], Hu Jiandong. Soil testing and fertilization [M]. Beijing: China Agriculture Press, 20o2.21o ~ 260. [4] in the days of Ren, Wang rights. Soil Analytical Chemistry [M]. Beijing: Science Press, 1988.75 ~ 17o. [5] Hu Jiandong,[link widoczny dla zalogowanych], Duan Tiecheng. Soil nutrient-speed portable measuring instrument technology [】]. Modern scientific instruments, 2002,84:27 ~ 30. [6] Hu Jiandong, Duan Tiecheng. Rapid determination of soil moisture sensing technique [J]. Scientific Instrument, 2003,24 (2): 142 ~ 145. [7] Yu Yong-chang, Hu Jiandong. Modern fuzzy control of greenhouse environment parameters [J]. Agricultural Engineering, 2002,18 (2): 72 ~ 75. [8] JJG179-1990, filter photoelectric colorimeter test order [s]. [9] He Limin. SCM Application Collection [M], Beijing: Beijing Aerospace University Press,[link widoczny dla zalogowanych], 1991.230 ~ 350. [10] Yuan Xiguang. Sensors Technical Manual [M], Beijing: National Defence Industry Press ,1986.187-230. [11] Duting hair. Modern Instrumental Analysis [M]. Changsha: National Defense University Press, 1994.77 ~ 109.
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