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椐此提出通过双钝体诱发卡门涡街增强涡街强度、提高涡街流量计的信噪比，进而降低涡街流量计的流量下限的方法。
The assemble criterion of sensor for design was advanced. At last, a method of increasing signal-to-noise ratio and reducing flux lower limit value of vortex flowmeter was advanced.
着重考虑了作为气体微流量标准装置核心的恒压式气体微流量计的原理、结构、下限因素和不确定度等基本问题。
The principle, structure, measurement limit and analyze of uncertainty of the constant pressure gas flowmeter, which was the key component of gas flow standard apparatus, were considered emphatically.
新设想集流型井下流量计具有测量下限低、测试范围广、自动分流、测点稳定等特点。
The new flowmeter has the characteristics of low floor level, extensive testing scope, automatic distributary and stable testing point.
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