Thalayasingam S, Delpy D T
Med Biol Eng Comput. 1989 Jul;27(4):394-8. doi: 10.1007/BF02441431.
A thermal clearance blood flow sensor has been designed which incorporates four separate sensing elements, permitting flow changes at four differing depths to be measured. Static and dynamic laboratory tests have confirmed the differing flow depth response of the sensor and demonstrated a linear response to flow over the physiological skin blood flow range. Flow depth response has been shown to be dependent upon sensor geometry. Response should also in theory be dependent on the thermal conductivity of the sensor body material. However, using conventional encapsulation materials, it does not seem possible to obtain a depth sensitivity of less than 0.2 mm.
一种热清除血流传感器已经设计出来，它包含四个独立的传感元件，能够测量四个不同深度处的血流变化。静态和动态实验室测试已经证实了该传感器不同的血流深度响应，并证明了在生理皮肤血流范围内对血流的线性响应。血流深度响应已被证明取决于传感器的几何形状。理论上，响应也应该取决于传感器主体材料的热导率。然而，使用传统的封装材料，似乎不可能获得小于0.2毫米的深度灵敏度。
