| 摘要 |
A device for testing nasal breathing comprises a face mask, an air flow pressure-difference transducer, an air flow sensor and mouthpiece, those are connected in sequence. Additionally a return valve, flow pressure-difference transducers, air flow sensor, analog-to-digital converter and personal computer are introduced. The return valve, flow pressure-difference transducers and air flow sensor are connected to air port of the face mask, outputs of the flow pressure-difference transducers and air flow sensor are correspondingly connected to first, second, third and fourth inputs of the analog-to-digital converter, which first output and fifth input are correspondingly connected to input and output of the personal computer. |
