Battrax SLIC Protector 2 - 50© 2004 Littelfuse, Inc.+1 972-580-7777SIDACtor ® Data Book and Design GuideBattrax SLIC ProtectorThis solid state protection device can be referenced to either a positive or negative voltage source. The B1xx0C_ is for a -V REF and the B2050C_ is for a +V REF . Designed using an SCR and a gate diode, the B1xx0C_ Battrax begins to conduct at |-V REF |+|-1.2V| while the B2050C_ Battrax begins to conduct at |+V REF |+|1.2V|.For a diagram of a Battrax application, see Figure 3.38.* For individual “CA” and “CC” surge ratings, see table below.General Notes:• All measurements are made at an ambient temperature of 25°C. I PP applies to -40°C through +85°C temperature range.• I PP is a repetitive surge rating and is guaranteed for the life of the product.• I PP ratings assume V REF = ±48V.• V DRM is measured at I DRM.• V S is measured at 100V/µs.• Off-state capacitance (C O ) is measured at 1MHz with a 2V bias and is a typical value. “CC” product is approximately 2x the listed value.• Positive Battrax information is preliminary data.• V REF maximum value for the negative Battrax is -200V.• V REF maximum value for the positive Battrax is 110V.(-V -Battrax B1xx0C_Pin 3Electrical ParametersPart Number *V DRM Volts V S Volts V T Volts I DRM µAmps I GT mAmps I T Amps I H mAmps C O pF B1100C_|-V REF | + |-1.2V||-V REF | + |-10V|45100 2.210050B1160C_|-V REF | + |-1.2V||-V REF | + |-10V|45100 2.216050B1200C_|-V REF | + |-1.2V||-V REF | + |-10V|45100 2.220050B2050C_|+V REF | + |1.2V||+V REF | + |10V|45502.25050Surge RatingsSeries I PP 2x10 µs Amps I PP 8x20 µs Amps I PP10x160 µs AmpsI PP10x560 µs AmpsI PP10x1000 µs AmpsI TSM 60 Hz Amps di/dt Amps/µs A 15015090605020500C50040020015010050500Battrax SLIC Protector© 2004 Littelfuse, Inc. 2 - 51 SIDACtor® Data Book and Design Guide+1 972-580-7777D a t a S h e e t sV-I Characteristics for Negative BattraxV-I Characteristics for Positive BattraxS。
第四讲机载LiDAR数据获取重要参数主要内容LiDAR数据获取重要参数——与LiDAR系统性能、数据质量相关的参数关系式或计算公式；——是进行激光遥感系统选择及航线设计的重要依据！⏹（1）瞬时视场角⏹（2）视场角⏹（3）脉冲频率⏹（4）扫描频率⏹（5）垂直分辨率⏹（6）最大飞行高度（最大量测距离）⏹（7）最小飞行高度⏹（8）激光脚点光斑的特性（9）扫描带宽（10）每条扫描带上的激光脚点数（11）激光脚点间距（12）必须航线数（13）实际量测面积（14）激光脚点密度（15）发射及接收激光束间隔内的飞行距离参数类型又称激光发散角，是指激光束发射时其发散的角度。
瞬时视场角的大小取决于激光的衍射（diffraction），是发射孔径D和激光波长λ的函数。
瞬时视场角（instantaneous field of view ，IFOV ）DIFOV λ44.2=由上式，可以计算得到IFOV =0.026 mrad 。
瞬时视场角的单位一般为毫弧（mrad ），Leica ALS50II 的瞬时视场角为0.22/0.15 毫弧。
nm1064=λcmD 10=算例：视场角（Field Of View，FOV）激光束的扫描角，指激光束通过扫描装置所能达到的最大角度范围。
早期LiDAR系统的扫描角一般较小，大约在30度，目前比较先进的LiDAR系统的扫描角都在60度-75度左右，基本能够达到航摄像机的视场角度范围。
脉冲频率单位时间内激光器所能够发射的激光束数量。
并不是脉冲频率越大越好，过于密集的激光脚点会带来大量的冗余数据，影响数据处理的效率和效果。
扫描频率扫描频率指线扫描方式，每秒钟所扫描的行数，即扫描镜每秒钟摆动的周期。
很明显，扫描频率越大，每秒钟的扫描线就越多扫描频率小扫描频率大脉冲通过的路径上所能够区分不同目标间的最小距离。
垂直分辨率若脉冲宽度为10ns ，则在一个脉冲宽度内，不同目标距离至少为1.5m ，其回波能量才可能经接收器检出，并区别开来。
