Chiu Y L, Asayama J, Ford L E
Am J Physiol. 1982 Nov;243(5):C299-302. doi: 10.1152/ajpcell.1982.243.5.C299.
A displacement-type photoelectric force transducer with a projection arm and a resonant frequency of 6 kHz is described. A vane on a moving element partially interrupts a light beam shining on a pair of phototransistors. Movement of the vane causes changes in the phototransistor currents, which are amplified to give an overall sensitivity of 10 mV/mg. Most of the half of each phototransistor not under the vane is covered by a mask, the edge of which is parallel to the edge of the vane. This increases the sensitivity of the transducer so that stiffer moving elements can be used. Compliance of the transducer at the tip of the projection arm is about 10 micrometers/g. The inertia of the lightweight moving element is minimized by having it rotate about a twisting strip hinge. The equivalent mass of the moving element at the tip, 6 mm from the pivot, is about 0.9 mg. The principal advantages of the transducer over other types is that it is nearly impervious to moisture.
描述了一种带有突出臂且谐振频率为6千赫的位移型光电力传感器。移动元件上的叶片会部分遮挡照射在一对光电晶体管上的光束。叶片的移动会导致光电晶体管电流发生变化，这些电流经过放大后可提供10毫伏/毫克的总体灵敏度。每个光电晶体管未被叶片覆盖的那一半大部分被一个掩膜覆盖，掩膜的边缘与叶片的边缘平行。这提高了传感器的灵敏度，从而可以使用更硬的移动元件。突出臂尖端处传感器的柔度约为10微米/克。通过让轻质移动元件绕扭转带铰链旋转，可将其惯性降至最低。在距枢轴6毫米处的移动元件尖端的等效质量约为0.9毫克。该传感器相对于其他类型传感器的主要优点是它几乎不受湿气影响。
