z Chapter Two Sensing Technology Chapter Study Tasks(2) In this chapter, you will be able to Get the general idea of remote sensing - Tell the difference between passive and active sensors -Get the general ideas of the texts and extensive -Complete all the practice required Unit4 a part 1 Notes to Text L Part4 Extensive Reading Part 2 Word Study Part5 Notes to Passage Part3 Practice on Text Part6 Practice on Passage 2021/2/20 P1
2021/2/20 P.1 Unit 4 Sensing Technology Chapter Two @ Part 1 Notes to Text & Part4 Extensive Reading & Part 2 Word Study @ Part5 Notes to Passage @ Part3 Practice on Text @ Part6 Practice on Passage Chapter Study Tasks（2） In this chapter, you will be able to —Get the general idea of remote sensing —Tell the difference between passive and active sensors —Get the general ideas of the texts and extensive —Complete all the practice required
a Part 1 Notes to text Sensing Technology A 1) remote sensing:遥感。 遥感泛指从远处探测、感知物体或事物的技术。即不直接接触物体本 身,从远处通过传感器探测和接收来自目标物的信息(如电场、磁 场、电磁波、地震波等信息),通过信息的传输及其处理分析,识 别物体的属性及其分布的特征的技术 2) Passive sensors detect natural energy(radiation) that is emitted or reflected by the object or surrounding area being observed被动传感器可以探测出由处于观察中的物体或区域发射或 反射出来的自然能(辐射)。 注释:自然界中的一切物体,只要温度在绝对温度零度(-27315摄氏 度)以上,都以电磁波的形式时刻不停地向外传送热量,这种传送 能量的方式称为辐射( Radiation)。物体通过辐射所放出的能量, 称为辐射能,简称辐射。所以其实辐射是无处不在的,只是我们平 时感觉不到而忽视了它;该句中的分词短语 being observed用作定 语,修饰 ithe object or surrounding area。 2021/2/20 P2
2021/2/20 P.2 @ Part 1 Notes to Text 1) remote sensing: 遥感。 遥感泛指从远处探测、感知物体或事物的技术。即不直接接触物体本 身，从远处通过传感器探测和接收来自目标物的信息（如电场、磁 场、电磁波、地震波等信息），通过信息的传输及其处理分析，识 别物体的属性及其分布的特征的技术。 2) Passive sensors detect natural energy (radiation) that is emitted or reflected by the object or surrounding area being observed.被动传感器可以探测出由处于观察中的物体或区域发射或 反射出来的自然能（辐射）。 注释：自然界中的一切物体，只要温度在绝对温度零度（－273.15摄氏 度）以上，都以电磁波的形式时刻不停地向外传送热量，这种传送 能量的方式称为辐射（Radiation）。物体通过辐射所放出的能量， 称为辐射能，简称辐射。所以其实辐射是无处不在的，只是我们平 时感觉不到而忽视了它；该句中的分词短语being observed用作定 语，修饰the object or surrounding area。 Sensing Technology
3)The latter, on the other hand, emits energy in order to scan objects and areas whereupon a passive sensor then detects and measures the radiation that is reflected or backscattered from the target.而后者本身散发出来能量,以便对被测物体和区域 进行扫描,这样,被动传感器就能探测和测量出由目标物反射或散发 出来的射线。 注释:主语 The latter指代 active sensors;注意 whereupon是连词, 意为“因此,于是”,引导结果状语从句; that is reflected or backscattered from the target是定语从句,修饰先行词the radiation 2021/2/20 P3 End
2021/2/20 P.3 3) The latter, on the other hand,emits energy in order to scan objects and areas whereupon a passive sensor then detects and measures the radiation that is reflected or backscattered from the target. 而后者本身散发出来能量，以便对被测物体和区域 进行扫描，这样，被动传感器就能探测和测量出由目标物反射或散发 出来的射线。 注释：主语The latter 指代active sensors；注意 whereupon是连词， 意为“因此，于是”，引导结果状语从句；that is reflected or backscattered from the target是定语从句，修饰先行词the radiation. End
L Part 2 Word Study 1. remote sensing遥感 11 emission n.散发,发射 2. acquisition n.取得,获得 12 probe n.探测器探测飞船 3 phenomenon n.现象 13mitv.散发,发射 4. intimate ad亲密的;密切的14 infrared adj红外线的 5. buoy n.浮标,航标 15 radiometer n.辐射仪,辐射计 6. stand- off adj对峙的 16 backscatter v.散射 7. pregnancy n.怀孕 17 deforestation n.砍伐森林 8. ultrasound n.超声波 18 glacier n.冰川,冰河 9. resonance n.共振;共鸣 19 in conjunction with与…协力 10 positron n.正电子,阳电子20 conservation n.保存,保护 2021/2/20 SPaY End
2021/2/20 P.4 End 1. remote sensing 遥感 11.emission n. 散发，发射 2. acquisition n. 取得，获得 12.probe n. 探测器,探测飞船 3. phenomenon n. 现象 13.mit v. 散发，发射 4. intimate adj. 亲密的；密切的 14.infrared adj. 红外线的 5. buoy n. 浮标，航标 15.radiometer n. 辐射仪，辐射计 6. stand-off adj. 对峙的 16.backscatter v. 散射 7. pregnancy n. 怀孕 17.deforestation n. 砍伐森林 8. ultrasound n. 超声波 18.glacier n. 冰川，冰河 9. resonance n. 共振；共鸣 19.in conjunction with 与 … 协力 10.positron n. 正电子，阳电子 20.conservation n. 保存，保护 & Part 2 Word Study
Part3 Practice on Text Task 1: Listening training Dictation of some key words Directions: You will hear some key words twice, most of which are taken from the Word Study. Then finish the Crossword Puzzle. ( See you book p. 2. Dictation of some key expressions Directions: You will hear some key expressions twice, most of which are taken from this text. Then you are asked to complete the missing words )remote sensing 4) passive sensors 2)physical or intimate contact 5) monitor deforestation 3)devices forgathering information 6) land usage and conservation 2021/2/20 P.5
2021/2/20 P.5 Task 1: Listening training Dictation of some key words Directions: You will hear some key words twice, most of which are taken from the Word Study. Then finish the Crossword Puzzle. (See you book p. ) 2. Dictation of some key expressions Directions: You will hear some key expressions twice, most of which are taken from this text. Then you are asked to complete the missing words. @ Part3 Practice on Text 1) remote_____________ 2) physical or_________________ 3) __________gathering information 4) ______________sensors 5) ____________deforestation 6) ___________and conservation sensing intimate contact devices for passive monitor land usage
Task 2. Read. Write and Translate Read and Reply the teacher. Then give short answers to the following questions. er Directions: Students are required to read aloud the whole text afte a) How does remote sensing acquire information of an object? By the use of either recording or real-time sensing device that is not in physical or intimate contact with the object. b) How many kinds of remote sensing are there? What are the differences There are two: passive and active sensors. Passive sensors detect natural energy that is em itted or reflected by the object or surrounding being observed, while the active sensors emit energy to and receive it from the target c)What advantages does remote sensing bring us? Remote sensing brings us a lot advantages in many fields, such as monitoring deforestation, the effect of global warming, depth sounding of ocean depth, military affairs, national defence amd natural resource management 、2022P6
2021/2/20 P.6 Read and Reply Directions:Students are required to read aloud the whole text after the teacher. Then give short answers to the following questions: a) How does remote sensing acquire information of an object? b) How many kinds of remote sensing are there? What are the differences? Task 2: Read, Write and Translate By the use of either recording or real-time sensing device that is not in physical or intimate contact with the object. There are two: passive and active sensors. Passive sensors detect natural energy that is emitted or reflected by the object or surrounding being observed, while the active sensors emit energy to and receive it from the target. Remote sensing brings us a lot advantages in many fields, such as monitoring deforestation, the effect of global warming, depth sounding of ocean depth, military affairs, national defence amd natural resource management. c) What advantages does remote sensing bring us?
Read and Judge (F 1)By means of physical or intimate contact with an object, remote sensing can acquire information of it T)2 Remote sensing applications can benefit us a lot in many respects, such as monitoring deforestation, the effect of global warming and depth sounding of ocean depths (F )3) Radar is an example of active remote sensing which cannot be used to establish the location, height, speed and direction of an object. (T)4)Nowadays, remote sensing is very useful in military affairs and national security. (T)5 Film photography, infred, charge-coupled devices and radio meters are all passive sensors. assive sensors 2021/2/20 P7 End
2021/2/20 P.7 ( )1) By means of physical or intimate contact with an object, remote sensing can acquire information of it. ( )2)Remote sensing applications can benefit us a lot in many respects, such as monitoring deforestation,the effect of global warming and depth sounding of ocean depths. ( )3) Radar is an example of active remote sensing which cannot be used to establish the location, height, speed and direction of an object. ( )4) Nowadays, remote sensing is very useful in military affairs and national security. ( )5) Film photography, infred,charge-coupled devices and radiometers are all passive sensors.assive sensors . Read and Judge End F T F T T
Read and Complete Directions: Read the following short passage. Complete it by filling in the missing words Adevice B varying C grain D such E. addition F result Gvary H depending Iequipped J required In1).E to one or more sensors, each node in a sensor network is typically 2 with a radio transceiver or other wireless communications 3) a small microcontroller, and an energy source, usually a battery. The size of a single sensor node can 4) from shoebox-sized nodes down to devices the size of 5) of dust. The cost of sensor nodes is similarly variable, 6)B from hundreds of dollars to a few cents, 7)H on the size of the sensor network and the com plexity 8) of individual sensor nodes. Size and cost constraints on sensor nodes 9):F corresponding constraints on resources 10)D as energy, memory computational speed and bandwidth. WZZ 2021/2/20 P 8 End
2021/2/20 P.8 Directions:Read the following short passage. Complete it by filling in the missing words. A.device B.varying C.grain D.such E. addition F.result G.vary H. depending I.equipped J. required In 1)______ to one or more sensors, each node in a sensor network is typically 2)_______ with a radio transceiver or other wireless communications 3) ______, a small microcontroller, and an energy source, usually a battery. The size of a single sensor node can 4)_______ from shoebox-sized nodes down to devices the size of 5)_____ of dust. The cost of sensor nodes is similarly variable, 6)_____ from hundreds of dollars to a few cents, 7)_____ on the size of the sensor network and the complexity 8)_____ of individual sensor nodes. Size and cost constraints on sensor nodes 9)_____ in corresponding constraints on resources 10)_____ as energy, memory, computational speed and bandwidth. Read and Complete End E I A G C B H J F D
Read and Translate Directions: Put the following sentences into English, using the words or phrases given 1)在今天的信息社会,信息的获取对我们的日常生活是非常重要的 (acquisition) In today, s information age, acqusition of information is very im portant to our daily life 2遥感技术已被广泛应用于军事,国防和自然资源管理( remote sensing technology) Remote sensing is widely used in military affairs, national defence and natural resource management. 3)主动式遥感能向目标物发射电磁波,同时接受反射回来的电磁波。 (emit) Active sensors emit electromagnetic waves to and, at the same time, receive them from the target 4)全球变暖对气候的影响非常明显,已对人类生存构成威胁。( global warming) The effect of global warming on the climate is quite obvious, which poses a threat to the survival of human beings 5)今天,越来越多的人认识到了土地的科学使用和土地保护的重要性。 (consevation) Today more and more people have realized the im portance of scientific usage and conservation of land 2021/2/20 .9y End
2021/2/20 P.9 1)在今天的信息社会，信息的获取对我们的日常生活是非常重要的。 （acquisition） 2)遥感技术已被广泛应用于军事，国防和自然资源管理（remote sensing technology） 3)主动式遥感能向目标物发射电磁波，同时接受反射回来的电磁波。 （emit） 4)全球变暖对气候的影响非常明显,已对人类生存构成威胁。（global warming） 5)今天，越来越多的人认识到了土地的科学使用和土地保护的重要性。 （consevation） Read and Translate Directions:Put the following sentences into English, using the words or phrases given. End In today’s information age, acqusition of information is very important to our daily life. Remote sensing is widely used in military affairs,national defence and natural resource management. Active sensors emit electromagnetic waves to and,at the same time, receive them from the target The effect of global warming on the climate is quite obvious, which poses a threat to the survival of human beings. Today more and more people have realized the importance of scientific usage and conservation of land
A Part4 Extensive ReadingImage dissector and Orthicon The image dissector(分析者) was invented by Philo Farnsworth, one of the pioneers of electronic television, in 1927. It is a type of cathode (ai)ray tube occasionally employed as a camera in industrial television systems. The image dissector had very poor light sensitivity, and was useful only where scene illumination( BF) exceeded 685 cd/m2, but it was ideal for high light levels such as when engineers wanted to monitor the bright, hot interior( apof an industrial furnace. Owing to its lack of sensitivity, the image dissector was rarely used in TV broadcasting, except to scan film and other transparencies. It was, however, the beginning of the electronic TV age. The image dissector sees the outside world through a glass lens, which focuses an image through the clear glass wall of the tube onto a special plate which is coated with a layer of caesium oxide( 1648). When light strikes caesium oxide, the material em its electrons somewhat like a mirror that reflects an image made of electrons rather than light. These electrons are aimed and accelerated by electric and magnetic fields onto the dissector's single electron 2021210k
2021/2/20 P.10 Image dissector and Orthicon The image dissector(分析者) was invented by Philo Farnsworth, one of the pioneers of electronic television, in 1927. It is a type of cathode (负极 ) ray tube occasionally employed as a camera in industrial television systems. The image dissector had very poor light sensitivity, and was useful only where scene illumination(照明) exceeded 685 cd/m2, but it was ideal for high light levels such as when engineers wanted to monitor the bright, hot interior(内部)of an industrial furnace. Owing to its lack of sensitivity, the image dissector was rarely used in TV broadcasting, except to scan film and other transparencies. It was, however, the beginning of the electronic TV age. The image dissector sees the outside world through a glass lens, which focuses an image through the clear glass wall of the tube onto a special plate which is coated with a layer of caesium oxide(氧 化铯). When light strikes caesium oxide, the material emits electrons, somewhat like a mirror that reflects an image made of electrons, rather than light. These electrons are aimed and accelerated by electric and magnetic fields onto the dissector's single electron & Part4 Extensive Reading