We present measurements of the ultrasound attenuation and sound velocity of a number of liquids, transparent biological materials (the vitreous and lens of the bovine eye), and biological fluids (whole blood) at frequencies between 925 and 1020 MHz by using a picosecond thermal grating. Sound velocity and attenuation measurements of liquids (e.g., methanol and ethanol) agree very well with those rdported in the literature. The sound velocity in the biological materials studied also agrees with the reported values in the literature. In contrast, the attenuation coefficients measured for biological mate 2000-5000 dB/cm, are much higher than would be extrapolated from published low-frequency. #1997 Optical Society of America
展开▼
机译：我们使用皮秒热光栅对频率在925和1020 MHz之间的液体，透明生物材料（牛眼的玻璃体和晶状体）和生物液体（全血）的超声衰减和声速进行了测量。 。液体（例如，甲醇和乙醇）的声速和衰减测量结果与文献中的数据非常吻合。研究的生物材料中的声速也与文献报道的值一致。相反，对生物伴侣2000-5000 dB / cm测得的衰减系数要比从公开的低频推断的衰减系数高得多。 ＃1997美国眼镜学会
展开▼
