自动对靶喷雾靶标红外探测研究

Target Infrared Detection in Target Spray

农林作物一般非连续种植,喷在农林作物靶标之间的药液造成巨大浪费和严重环境污染,因此探讨利用红外线探测技术实现靶标的自动探测,对靶精准喷施意义重大。红外线可有效防止可见光的干扰,响应速度快,可实现无接触探测,由此建立的红外光电探测系统可靠性好、成本低。红外发光管发射出红外光照射到被探测物体上,反射的红外线被光电探测器接收,触发控制信号,实现自动对靶施药。系统中不同探测器组采用不同编码的调制脉冲红外信号,可消除组间光路干扰及其他光信号的干扰。实验结果表明所建立的红外靶标自动探测装置可对农林作物靶标进行自动探测,光波波长为850nm,探测距离为0.1～6m可调,靶标最小识别间距小于0.3m。

Crops in agriculture and forestry are normally planted discretely. The chemical sprayed between crops would cause great waste and serious environment pollution. Therefore realization of the precision spray has great significance. This research discussed the method to realize automatic target detection using infrared detect technology. The infrared can avoid the interference of the visible light effectively and the response speed is very fast. Therefore it can be used to implement non-tough detection. Photoelectric detection systems based on infrared detect technology are normally stable, reliable, low cost, simple structure, and easy to be practically utilized. Therefore it is widely used in the on-line real time detection field. Its key point is to determinate the characteristic wavelength or wave band. The infrared lights emitted from the infrared light emitting diode were irradiated to the detected objects. The reflected infrared lights could be received by the photoelectric device. Then control signal was triggered and automatic target spray was realized. Code-division infrared detection circuit was used in the system. Modulated pulse infrared signals using different coding were used in different photodetector units in the built system so as to eliminate the light path interference between different detector units and other light signal interferences. Therefore the interference capacity of the system is high. The test results showed that the automatic target spray equipment set up in the study could detect crop targets automatically. The light wavelength used in the test is 850 nm. The detection range was tunable within 0. 1-0.5 m. The least targets detectable distance was less than 0. 3 m.