生物肌肉组织δ色散机理

Mechanism of δ dispersion of biological muscular tissue

以人体肌肉组织为例,研究δ色散发生的频率区间,验证δ色散是一种发生在较宽频率范围内的色散现象.改变4阶Cole-Cole模型中的4个弛豫时间,粗略判断4种色散发生的频率区间,在此频率区间内通过数值计算得出介电常数及其增量,并据此判断α、β、δ、γ色散发生的精确频率区间.结果表明肌肉组织α色散发生的频率区间在4种色散中是最窄的,但对应的介电常数的变化量是4种色散中最大的.β色敞发生的频率范围较α色敞的大,对应的介电常数的变化范围小于α色散的.δ色敞发生的频率范围比α、β色散的都大,但其对应的介电常数比α、β色散的要小.γ色散对应的介电常数是4种色散中最小的.

The frequency range of δ dispersion of biological muscular tissue was studied and the fact that the δ dispersion occurs over a wide frequency range was verified. The frequency ranges were roughly evaluated by changing four relaxation time parameters by using the four-order Cole-Cole model. Afterwards, the dielectric constants and their increments within the frequency ranges were numerically calculated. Base on the increment of the dielectric constants, the precise frequency range of α, β, δ and γ dispersions in muscular tissues were evaluated. The results showed that the α dispersion of muscular tissue presented the most narrow frequency range compared with any other type of dispersion, the corresponding increment of dielectric constant was larger than that of any other dispersion, The frequency range of β dispersion was wider than that of α dispersion. However, the increment of the dielectric constant of β dispersion was smaller than that of α dispersion. The δ dispersion frequency range was wider than those of a and fl dispersions. And the corresponding increment of dielectric constant was smaller compared with those of α and β dispersions. The γ dispersion increment of dielectric constant was the narrowest.