传感器1（Sensor 1）October 2012 selfSensors and detection technology (02202) review guidanceUnit synthesis test 1 (Chapter 1 to fourth)Tip: focus on examining the definition, composition, classification, sensor static and dynamic characteristics, and the calibration of the main performance indexes of the meaning, concept and method of calibration; parameter type, power type, large displacement type displacement sensor working principle, characteristics and application; force, torque, pressure, speed, acceleration sensor type and working principle etc..First, the multiple-choice question1, according to the composition of the sensor, the following can directly feel the measured physical quantity is (A)A sensitive element,B conversion element,C conversion circuit,D amplifying circuit2 、 a sensor made of the principle that the physical and chemical properties of a substance changes with the measured parameters is called BA structured sensors,B physical sensors,C active sensors,D passive sensors3, according to the sensor energy source classification, thefollowing belongs to the passive type sensor is (C)A resistor type B, capacitive C, electrothermal D, Holzer type4, the following indicators of sensors, which do not belong to the dynamic performance indicators of the sensor is ()A stability time,B natural frequency,C overload capacity,D amplitude frequency characteristic5, the sensor can be determined by dynamic calibrationA accuracy,B sensitivity,C linearity,D natural frequency6, the use of differential transformer displacement sensor displacement measurement, in order to identify the moving direction of objects, processing equipment must have links is ()A filter,B amplification,C rectification,D phase sensitive detection7, the following displacement sensor can measure large displacement is ()A potentiometer displacement sensor,B capacitive displacement sensor,C inductive displacement sensor,D Inductosyn8, the following is not a piezoelectric gyro angular velocity sensor is ()A vibration beam type,B double plate type,C bend type,D round tube type9, phase discriminator inductosyn according to the induction electromotive force () to identify displacement.A amplitude,B phase,C frequency,D phase and frequency10, when the DC speed generator has the load, the output voltage is compared with the armature induction electromotive forceA the former is large,B is small,C is equal, andD is uncertain11, if the grating grating displacement sensor is 0.04 mm, the gate line angle is 1.8 degrees, then the spacing of two adjacent to the moire fringe ()A 0.022 mmB 0.07 mmC 1.27 mmD 3.99 mm12 capacitance torque measuring instrument is to use the force of the axle, the capacitor between the two plates () changes to measure torque.A spacing,B relative effective area,C dielectric constant, D, breakdown voltageTwo. Fill in the blanks13, when the input sensor is either constant or varies slowly with time, the relationship between input and output of the sensor is called static sensor {}.14, the sensor response characteristics must satisfy the measurement conditions ___________ in the frequency range of the measurements.15, the capacitance of capacitive sensor is a function of the dielectric constant of the electrode area, and _________ between the plates of the medium.16, self inductance type displacement sensor can be divided into variable area type and ___________________ type, variable air gap.17, eddy current displacement sensor is the use of______________ will change the measured conversion device for changing the coil impedance.18, the magnetic grid displacement sensor can be divided into the measurement of linear displacement of the long magnetic grid and angle displacement measurement _________.19, magnetoelastic torque instrument is also known as_____________________.20, for a given piezoelectric material, when the mass increases or piezoelectric increased when the sensitivity of ________.21, no-load output voltage of DC tachogenerator and speed ___________________.22, when measuring the slow signal or measured by the chargeoutput when the occasion, the two piezoelectric element of ____.23, charge amplifier input impedance in ___________ ohm.24, the piezoelectric sensor must be pre amplifier connected ______________ when in use.Unit synthesis test two (fifth to seventh)Note: we have the type of artificial vision sensor, vision sensor and various components of the function and method of image processing, photoelectric semiconductor, solid camera; principle of infrared image sensor; temperature sensor temperature classification, mechanism and method, structure, characteristics and application;Working principle of gas sensor, temperature sensor and moisture sensor.First, the multiple-choice question1. The main function of the receiving part of the vision sensor is ()A gives full play to the important conditions of sensor performanceB converts an optical image signal into an electrical signalC converts the electrical signals of two-dimensional imagesinto one-dimensional signals in time seriesD extracts effective information2 、 the function that the vidicon does not have is ()A photoelectric conversion function,B scanning function, C, D/A function, D storage function3. The camera element of the solid semiconductor camera can be abbreviated as ()A, CCD, B, VCD, C, VTR, D, VCR4, in artificial vision systems, brightness information can be digitized by means of.A D/A converter,B A/D converter,C adder,D integrator5 parallel thermocouples can be used for measurementA instantaneous change of temperatureB single constant temperatureC average temperatureD temperature difference6. Measure the temperature of the object that cannot be reached directly. The type of temperature sensor to choose is ()A thermocoupleB brightness typeC thermal resistanceD semiconductor type7, thermopile refers to which of the following thermocouples?A series thermocouple,B parallel thermocouple,C film thermocouple,D sheathed thermocouple8, in general, require thermistor type temperature sensor thermistor and temperature ()A is sinusoidal,B is cosine relationship,C is linear, andD is linear in a certain range9. The higher the temperature measured by the metal thermal resistance temperature sensor, the movement of the free electrons in the sensitive elementA the more regular theB is, the more irregular theC is normal distribution, and theD is linear10, SnO2 gas sensors are widely used in ()A measure the quality of gas, B, fire alarm, C, measure the concentration of gas, D for electrical parts11. The tape recorder uses () senses the temperature inside the machine, and when the humidity reaches a certain level, the machine stops automatically.A electronic hygrometer,B macromolecule membrane humidity sensor,C ceramic humidity sensor,D condensation sensor12 、 practical moisture sensor is to use the relationship between the measured substances (and) and moisture content toachieve moisture content measurement.A resistance valueB capacitance valueC voltage valueD current valueTwo. Fill in the blanks13, commonly used gas sensors according to the structure type can be divided into sintered, _________ and thick film type three.The main purpose of the 14 artificial vision system, image processing is ___________, image recognition for.15 methods, image processing and _____________________ calculus.16, the sliding sensor is refers to between the Department and the operation of inspection robot object tangential________________.17, the working principle of thermocouple temperature sensor is based on _____________________.Principle 18, brightness temperature sensor for object____________ transform with temperature, brightness of a narrow region and the measured object of spectrum and standard radiator compared to measure temperature.19, a semiconductor temperature sensor based on_____________________.20, including thermocouple thermoelectric EMF and_____________________ contact.21, when there is condensation inside the tape recorder, tape and drive mechanism between ______ will increase.In _____________ within the total radiation energy and the temperature dependence of temperature measurement object 22, radiation temperature sensor using.23, electronic hygrometer consisting of a detection part, a digital display and _______________.24, the gas sensor is a gas sensor will detect ____________ into electrical signals.Unit synthesis test three (eighth to ninth)Tip: classification, main test bridge application and working characteristics, types of filter, amplitude frequency characteristic, function and advantages, common methods of digital filter, digital analog conversion principle and technical index; sampling theorem, theorem and the resolution to four times subdivision principle, and the formation of the sources of interference and suppression methods, signal linearization signal processing method; the classification, description, description, amplitude frequency domain electromagnetic vibration exciter principle etc..First, the multiple-choice question1 、 the function of the bridge measuring circuit is to change the parameter of the sensor into (C) or the output change of the current.A resistor,B capacitor,C voltage,D charge2, the output voltage of a single arm bridge is 10V, and the output voltage is nonlinear relationship with the resistance change. After linearization, the output voltage is 10.2V, and the nonlinear error of the bridge is ()A 1.96%,B 2%,C 8%,D 92%3, if the detection system is not too high filter requirements, you can use ()A passive filter,B active filter,C low-pass filter,D high pass filter4, the resistance R in the band-pass filter circuit is increased, then the central angle frequency ().A increases B, decreases C, and D remains unchanged5 、 passive RC first-order high pass filter outputs the output voltage from (both) ends.A resistor, R,B capacitor,C C operational amplifier,D inductance, L6. The buffer is usually used at the output stage of the sampling humidifierA reduces the input impedance of the signal source, B, and increases the output impedance of the signal sourceC the input impedance of the smaller loadD increases the input impedance of the load7 、 in the grating displacement sensor with four times subdivision, the phase difference can not be determined according to the phase difference between two signalsA 45 degrees B, 90 degrees C, 135 degrees D, 180 degreesIn 8, by limiting the maximum deviation of the digital filter, if the limit deviation of delta Y is less than or equal to 0.01, the sampling value of 0.415, the last sampling value is 0.403, the sampling value should be (Yn)A 0.401,B 0.403,C 0.408,D 0.4159, the autocorrelation function of the periodic signal must be ()A periodic function, B, aperiodic, odd function, C, aperiodic even function, D linear function10, the known signal x (T) is completely related to the signal Y (T), and the correlation of the two signals satisfies ()A P XY (T) > 1B P XY (r = 1)C 0, XY < p < 1 (R),D XY (r = 0).11, the time delay is zero, the signal autocorrelation function is (signal)A mean,B mean square,C variance,D amplitude12, the Fu Liye transform of the known function x (T) is X (f), and the Fu Liye transform of function y (T) =x (-t) is ()A, X (f), B - X (f), C, X (-f), D - X (-f)Two. Fill in the blanks13, access bridge according to the measured resistance can be divided into different Wheatstone bridge and _____________.In 14, the bridge measurement circuit, according to the different __________ by bridge, bridge can be divided into direct current and alternating current bridge.15, in order to obtain the frequency signal of a certain frequency, can be used _______________.16, the signal frequency is higher than 500Hz, can be used for _______________ filter.17, RC low-pass filter RC value is higher, while lower cut-off frequency is _______________.18, in the sample and hold circuit, sampling switch off time is called _______________.19, if a grating of 25 lines / mm, is four times the resolution of _______________ division.20, the known function of X (T) of the Fourier transform of X (f), if x (T) is an odd function, X (f) for ___________.21, a resistor R and capacitor C in series and then connected in parallel to the power switch or relay ends RC absorption circuit, its function is _______________.22, if the relationship between the two signals is 0, indicating the two signal _______________.23, periodic signal spectrum harmonic, discrete and_______________.24, if the input function is x (T) and the output function of Y (T) coherent function gamma 2XY (?) =0, X (T) and Y (T)_______________.。
