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应用气压计(恒温气压计及精密无液气压计)测量井巷通风阻力时,有逐点测量法和同时测量法。采用逐点测量法时都要用一台校正气压计安在地表(或井下),专门用作在观测巷道前后两测点气压计读数时观测地表气压变化值,作为地表气压变化引起该巷道气压变化对气压计读数校正用。即认为地表气压变化引起井下不同深度各点的气压变化都是相等的。设△P。为地表气压变化
Application of barometers (thermostatic barometer and precision aneroid barometer) measurement of roadway ventilation resistance, there is a point-by-point measurement and simultaneous measurement. When using point-by-point measurement method, a calibrated barometer should be installed on the ground surface (or downhole) exclusively to observe the variation of barometric pressure when the barometer readings are made before and after the observation point. As the change of surface pressure causes the pressure of the roadway Change the barometer reading correction. In other words, it is considered that the pressure changes at different points in the underground are the same. Set △ P. For the surface pressure changes