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针对原子吸收分光光度计的车载化需求,提出了一种半悬浮式光学基座的设计方案以减轻车载震动条件对仪器性能的影响。根据该设计方案制作了2台样机安装到检测车和实验室,分别在检测车行驶0、1000、2000km后同时进行了性能测试和土壤样品中有效铜、钙含量的测量。结果表明,该仪器于车载和实验室条件下3次测量的波长准确度与重复性、波长分辨率、基线稳定性、精密度、背景校正能力等性能指标,均达到了GBT15337-2008所规定的标准。在相同行驶里程,对车载环境和实验室环境对土壤有效铜及有效钙进行测试,含量无显著性差异。因此,基于半悬浮式光学基座的原子吸收分光光度计可用于车载条件下进行土壤养分测试。
Aiming at the demand of car-mounted atomic absorption spectrophotometer, a design scheme of semi-floating optical base was proposed to reduce the influence of vehicle vibration conditions on the performance of the instrument. According to the design scheme, two prototypes were installed in the test car and the lab. The performance tests and the effective copper and calcium contents in the soil samples were carried out at the same time when the test car ran 0, 1000 and 2000 km respectively. The results showed that the performance indexes of wavelength accuracy and repeatability, wavelength resolution, baseline stability, precision and background correction capability of the three measurements under the vehicle and laboratory conditions all reached the requirements of GBT15337-2008 standard. In the same mileage, on the vehicle environment and laboratory environment of soil available copper and available calcium test, content was no significant difference. As a result, atomic absorption spectrophotometers based on semi-suspended optical pedestals can be used for soil nutrient testing under vehicle conditions.