华南农业大学试卷.docVIP

华南农业大学期末考试试卷（A卷） 2015年第 秋季 学期 考试科目：　Automotive Sensors 　 考试类型：（开卷）考试　　　 考试时间：　120 　分钟 学号 姓名 年级专业 题号 一 二 三 四 五 总分 得分 评阅人 Fill in the blanks（20%） Measuring principle of non-contacting temperature measurement is__in use which measure the medium’s temperature by means of its thermal radiation________, and one sensor type example of it is_Bolometer_____________. Seebeck effect means__the_production of an electric current in a circuit containing junctions between different metals or semiconductors kept at different temperatures______________. Sensor and measuring principles which only measure minute shifts/movements are used to measure variables such as _Eddy-current sensors__________and_Hella sensors____________________. A short-circuiting-ring sensor can be used to measure__the controll-rack setting on in-line diesel injection pumps_______; A rain sensor is used to __detect fine raindrops on the windshield_____________. “Piezoelectric effect” means__Electric charges are induced on the crystal surface by exerting a compression ro elongation force along certain crystal axes.________ and “reverse piezoelectric effect” means_the positive ions in the electric field migrate toward the negative electrode, and_negative ions toward the positive electrode. The crystal then contracts or expands depending on the direction of the electric field strength______. For speed sensors, normally passive rotors are in the form of __gearwheels_______________. For an inductive engine-speed sensor two variable are measured at the same time: ___engine rpm_______ and ___crankshaft positive______. 5) “Yaw rate” refers to _the vehicle rotation about its vertical axis__________. It is measured using _piezoelectric “tuning-fork”yaw-rate sensor_________, and this type of sensor normally works on the principle of____yaw-rate gyroscope____________________. 6) One exemplary use of microbending effect of fiber-optic sensor is:__providing fin