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$(this).css({"color":"#1479d7","border-bottom-color":"#1479d7"}); }); }); </script>  <div class="cpjj"> <p><strong>简介：</strong></p><p>大多数应用中，甲烷扩散性排放测量需要非常高的灵敏度和选择性。我们生产的经典仪器根据近红外吸收原理，可用于测量垃圾填满场中未控制的沼气排放量，垃圾填埋场中沼气量不足以满足科学家和工程师对测定与土壤呼吸相关的气体交换的需求。见天然气的天然或人工水库、�/p><p>为满足市场需求，WEST Systems公司研发了特殊检测器，灵敏度、选择性和稳定性均达到测量要求，可测量超低水平的扩散通量，但仍保证仪器的便携性与自主性、�/p><p><strong>灵敏度与选择�?/strong></p><p>该检测器根据可调谐半导体激光吸收光谱（TDLAS）结合Herriot多通道池来提高光学路径长度和检测器的灵敏度。TDLAS相对于其他技术的优点就是测量浓度可达到超低下限：LDL=100ppb、�/p><p>该检测器有两个满刻度值：150ppm�?0%，自动选择合适的刻度值。图面中为Herriot池，显示的是激光束的多次反射、�/p><p><strong>准确度：</strong></p><p>测量的准确度是通量的函数：</p><p>CH4 TDLAS</p><p>范围�?.5 - 1500 mmoles /m ��� :��25%</p><p>范围�?.5 - 1000 moles /m ��� :��10%</p><p>CO2：LICORLI820 � LI840</p><p>范围�? - 1500 mmoles /m ��� :��25%</p><p>范围�?.5 - 300 moles /m ��� :��10%</p><p>该仪器也可以测量H2S扩散通量、�/p><p><strong>电池寿命长：</strong></p><p>TLDAS CH4检测器所需功率非常低：2W。所以通过使用单光低成本的镍氢电池就可长时间操作、�/p><p>该仪器总重，包括背包、电池、累积舱室不超过10kg。该仪器配有两块电池，方便更换以确保长时间操作使用、�/p><p><strong>管理与测绘：</strong></p><p>通过手持电脑（PDA）管理该通量计，允许对采集的数据进行地理参考。通过选择正确的PDA，可得到所需的的地理参考。所有PDA均可获得标准计量精度(Err�?0m)，使用可选件Trimble</p><p>GNNS模块可得到子计量精度(Err�?m)、�/p><p>该通量计提供允许数据后期处理和数据以Excel格式导入的软件、�/p> </div>  <div class="cxd"> <div class="cxd_tit"><span></span>创新炸�/div> <p style=" color: #333; 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