Mendes Luciano B, Ogink Nico W M, Edouard Nadège, van Dooren Hendrik Jan C, Tinôco Ilda de Fátima F, Mosquera Julio
Institute for Agricultural and Fisheries Research (ILVO), Technology and Food Science Unit (T&V), Burg. Van Gansberghelaan 115, 9820 Merelbeke, Belgium.
Wageningen UR Livestock Research, P.O. Box 135, 6700 AC Wageningen, The Netherlands.
Sensors (Basel). 2015 May 13;15(5):11239-57. doi: 10.3390/s150511239.
The tracer gas ratio method, using CO2 as natural tracer, has been suggested as a pragmatic option to measure emissions from naturally ventilated (NV) barns without the need to directly estimate the ventilation rate. The aim of this research was to assess the performance of a low-cost Non-Dispersive Infra-Red (NDIR) sensor for intensive spatial field monitoring of CO2 concentrations in a NV dairy cow house. This was achieved by comparing NDIR sensors with two commonly applied methods, a Photo-Acoustic Spectroscope (PAS) Gas Monitor and an Open-Path laser (OP-laser). First, calibrations for the NDIR sensors were obtained in the laboratory. Then, the NDIR sensors were placed in a dairy cow barn for comparison with the PAS and OP-laser methods. The main conclusions were: (a) in order to represent the overall barn CO2 concentration of the dairy cow barn, the number of NDIR sensors to be accounted for average concentration calculation was dependent on barn length and on barn area occupation; and (b) the NDIR CO2 sensors are suitable for multi-point monitoring of CO2 concentrations in NV livestock barns, being a feasible alternative for the PAS and the OP-laser methods to monitor single-point or averaged spatial CO2 concentrations in livestock barns.
示踪气体比率法,即使用二氧化碳作为天然示踪剂,已被提议作为一种实用的方法,用于测量自然通风(NV)畜舍的排放量,而无需直接估算通风率。本研究的目的是评估一种低成本的非分散红外(NDIR)传感器在NV奶牛舍中对二氧化碳浓度进行密集空间现场监测的性能。这是通过将NDIR传感器与两种常用方法进行比较来实现的,即光声光谱气体监测仪和开放路径激光(OP-激光)。首先,在实验室中对NDIR传感器进行校准。然后,将NDIR传感器放置在奶牛舍中,与PAS和OP-激光方法进行比较。主要结论如下:(a)为了代表奶牛舍的整体二氧化碳浓度,用于平均浓度计算的NDIR传感器数量取决于畜舍长度和畜舍占地面积;(b)NDIR二氧化碳传感器适用于NV家畜舍中二氧化碳浓度的多点监测,是PAS和OP-激光方法监测家畜舍单点或平均空间二氧化碳浓度的可行替代方法。