| Wheat is one of the most important grain plants. Quickly and non-damage to measure the nutrition component of wheat is very important in the field of wheat's purchase and production. The measures based on NIR apparatus have been widely certificated in the field of grain measurement. Making use of advantages of LED's small dimension, low power waste and the relatively narrow bandwidth of interference filter, we develop a portable apparatus which made up of NIR LED and interference filter, provide a economical and quickly non-damage measurement of wheat components' concentration on fieldwork.The apparatus adopt method of long light path transmission. The apparatus uses 880,950nm NIR LED as light source, interference filter as homochromy device, Si photronic as detector. Digital signal comes from AD transformation, processed by microprocessor system. To reduce the influence which taken by huge grain, we put the sample for many times. The spectrum used for modal set is transmitted to PC by RS232.To get the relation between the spectrum and nutrition component's concentration, we set up the modal used method of stepwise regression in PC, transmit the coefficient of modal to apparatus, then we can predict the nutrition component's concentration of the wheat sample.This paper introduced the design of hardware, software, anti-disturb, low power waste and the model establish & predict the concentration of wheat's protein detailed. The following is the result: for calibration set, correlation coefficient R = 0.84, coefficient of variation is 5.45%; for prediction set, correlation coefficient R = 0.93, coefficient of variation is 5.54%. The analysis of experiment's result shows that this apparatus can fulfill the application of practice using.Compared with other instrument, the apparatus has many advantages, such as compact space, simple structure, low power waste, and anti-shake. The apparatus can realize non-damage measurement of wheat components' concentration on fieldwork.
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