The ultrasound pressure-strain loop (PSL) technique is a non-invasive method of examining myocardial work, which takes into account the effect of cardiac afterload on deformation and combines the overall longitudinal ...The ultrasound pressure-strain loop (PSL) technique is a non-invasive method of examining myocardial work, which takes into account the effect of cardiac afterload on deformation and combines the overall longitudinal strain force of the left ventricle with the changes in the left ventricular pressure, allowing earlier detection of possible subclinical cardiac damage in patients, and a more accurate and non-invasive assessment of the patient’s myocardial work performance. In this article, we will discuss the progress of PSL applications in cardiovascular diseases.展开更多
长周期光纤光栅(Long period fiber Grating,LPFG)作为一种透射型的光纤无源器件,它的谐振波长和损耗峰幅值对外界环境的变化,尤其对于轴向应变,非常敏感。本文对单个LPFG以及将级联LPFG内嵌于萨格纳克环(Sagnac环)进行了轴向应变传感...长周期光纤光栅(Long period fiber Grating,LPFG)作为一种透射型的光纤无源器件,它的谐振波长和损耗峰幅值对外界环境的变化,尤其对于轴向应变,非常敏感。本文对单个LPFG以及将级联LPFG内嵌于萨格纳克环(Sagnac环)进行了轴向应变传感的实验研究,主要是通过改变基于Sagnac环级联LPFG的轴向应变,来分析透射谱中选定损耗峰的幅值的变化情况。实验结果表明,随着轴向应变的改变,损耗峰的幅值呈线性变化,单个LPFG的灵敏度为-1.284×10^(-2)dB·με^(-1),而基于Sagnac环级联LPFG的灵敏度高达-1.0118×10^(-1)d B·με^(-1),是前者的7.88倍左右,且二者都具备非常好的方向可重复性。展开更多
文摘The ultrasound pressure-strain loop (PSL) technique is a non-invasive method of examining myocardial work, which takes into account the effect of cardiac afterload on deformation and combines the overall longitudinal strain force of the left ventricle with the changes in the left ventricular pressure, allowing earlier detection of possible subclinical cardiac damage in patients, and a more accurate and non-invasive assessment of the patient’s myocardial work performance. In this article, we will discuss the progress of PSL applications in cardiovascular diseases.
文摘长周期光纤光栅(Long period fiber Grating,LPFG)作为一种透射型的光纤无源器件,它的谐振波长和损耗峰幅值对外界环境的变化,尤其对于轴向应变,非常敏感。本文对单个LPFG以及将级联LPFG内嵌于萨格纳克环(Sagnac环)进行了轴向应变传感的实验研究,主要是通过改变基于Sagnac环级联LPFG的轴向应变,来分析透射谱中选定损耗峰的幅值的变化情况。实验结果表明,随着轴向应变的改变,损耗峰的幅值呈线性变化,单个LPFG的灵敏度为-1.284×10^(-2)dB·με^(-1),而基于Sagnac环级联LPFG的灵敏度高达-1.0118×10^(-1)d B·με^(-1),是前者的7.88倍左右,且二者都具备非常好的方向可重复性。
