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目的掌握西瓜品质检测试验台光照箱内部光热环境变化。方法在西瓜品质检测试验台的光源开启后30min内,每隔1min采集光照箱的温度和光源的光谱。对光照箱的温度变化过程采用一阶系统的阶跃响应过程进行分析,将光谱分为可见光波段(400～700nm)和近红外波(700～1100nm),通过对其光谱值积分得到其光谱能量,并对光谱能量随时间变化的情况进行分析。结果采用一阶系统的阶跃响应公式计算得到各观测时刻的温度计算值与实测值的相关系数为0.9997,西瓜品质检测试验台光照箱内温度稳定时间小于15min,光源的光谱稳定时间小于1min。结论西瓜品质检测试验台光照箱温度升高过程为一阶系统的阶跃响应过程,西瓜品质检测试验台光照箱内光热环境稳定时间不大于15min,西瓜品质检测试验可在光源开启15min之后进行。
Objective To grasp the changes of light and heat environment inside the light box of watermelon quality test bench. Methods The temperature of the light box and the spectrum of the light source were collected every 1 min within 30 min after the light source of the watermelon quality testing table was switched on. The temperature response of the light box was analyzed by the first-order system step response process. The spectrum was divided into visible light (400-700nm) and near infrared (700-1100nm), and its spectral energy was obtained by integrating its spectral value , And analyze the changes of spectral energy with time. Results The correlation coefficient between calculated and observed values of each observation time was 0.9997. The temperature stability time of watermelon in test table of watermelon quality was less than 15min, and the spectrum stability time of light source was less than 1min. Conclusion The temperature rise process of the light box of the watermelon quality testing bench is the step response of the first order system. The light and light environment stability time in the light box of the watermelon quality testing bench is not more than 15min. The watermelon quality testing can be carried out after the light source is turned on for 15min .