{'fraction_non_alphanumeric': 0.0104, 'fraction_numerical': 0.0008, 'mean_word_length': 5.318181818181818, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Simulation of Indoor Environment Monitor Calibration Gas Mantle Based on FLUENT

The concentration error of standard gas in different locations of calibration system will have different degrees of impact on accuracy of calibration results. Among them, concentration of standard gas in gas mantle that combine detection sensors and gas transmission pipelines show the greatest impact on calibration results. In order to realize monitoring and analysis of the overall calibration process, this paper simulated gas concentration change status during calibration process of indoor environmental monitor gas mantle by FLUENT software. Gas concentration change status and sensor measurement accuracy at situations of different size sensors placed in the same gas mantle at the same location and same sensor placed in the same gas mantle at different location were analysed. Simulation results show that to make gas most quickly and evenly filled gas mantle, gas mantle size should be slightly larger than sensor and sensor should be placed in the top of the mantle as far as possible. On this condition, it can ensure gas concentrations error range between sensor workface and the inlet are within ±2%, thereby ensuring the accuracy of calibration results.