Development of high-sensitivity and ultra-low volume infrared gasspectroscopy system for breath analysis

为了检测呼吸中的微量成分，研制了一种利用量子级联激光器和中空光纤的光谱测量系统。通过优化光学系统和信号处理方法，成功实现了ppm级气体组分的定量测量。随后，为了进一步开发具有高灵敏度的腔衰荡光谱系统，制作了具有内介电层的中空光波导。通过在内部形成多个介电层，与普通中空波导的单介电层相比，传输损耗大大降低。

To detect minor components in breath, a spectroscopic measurement system using a quantum cascade laser and a hollow optical fiber was developed. By optimizing the optic system and signal processing method, quantitative measurement of ppm-order gas component was successfully demonstrated. Subsequently, to devlop a cavity-ring-down spectroscopy system having further high sensitivity, hollow optical waveguides with inner dielectric layers were fabricated. By forming multiple dielectric layers on the inside, the transmission losses are largely decreased compared to common hollow waveguides with a single dielectric layer.