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传感器的静态特性是指对静态的输入信号,传感器的输出量与输入量之间所具有相互关系。因为这时输入量和输出量都和时间无关,所以它们之间的关系,即传感器的静态特性可用一个不含时间变量的代数方程,或以输入量作横坐标,把与其对应的输出量作纵坐标而画出的特性曲线来描述。表征传感器静态特性的主要参数有:线性度、灵敏度、迟滞、重复性、漂移等。
1.线性度:指传感器输出量与输入量之间的实际关系曲线偏离拟合直线的程度。定义为在全量程范围内实际特性曲线与拟合直线之间的zui大偏差值与满量程输出值之比。
2.灵敏度:灵敏度是传感器静态特性的一个重要指标。其定义为输出量的增量与引起该增量的相应输入量增量之比。用S表示灵敏度。
3.迟滞:传感器在输入量由小到大(正行程)及输入量由大到小(反行程)变化期间其输入输出特性曲线不重合的现象成为迟滞。对于同一大小的输入信号,传感器的正反行程输出信号大小不相等,这个差值称为迟滞差值。
4.重复性:重复性是指传感器在输入量按同一方向作全量程连续多次变化时,所得特性曲线不*的程度。
5.漂移:传感器的漂移是指在输入量不变的情况下,传感器输出量随着时间变化,此现象称为漂移。产生漂移的原因有两个方面:一是传感器自身结构参数;二是周围环境(如温度、湿度等)。
6.分辨力:当传感器的输入从非零值缓慢增加时,在超过某一增量后输出发生可观测的变化,这个输入增量称传感器的分辨力,即zui小输入增量。
7.阈值:当传感器的输入从零值开始缓慢增加时,在达到某一值后输出发生可观测的变化,这个输入值称传感器的阈值电压。
所谓动态特性,是指传感器在输入变化时,它的输出的特性。在实际工作中,传感器的动态特性常用它对某些标准输入信号的响应来表示。这是因为传感器对标准输入信号的响应容易用实验方法求得,并且它对标准输入信号的响应与它对任意输入信号的响应之间存在一定的关系,往往知道了前者就能推定后者。zui常用的标准输入信号有阶跃信号和正弦信号两种,所以传感器的动态特性也常用阶跃响应和频率响应来表示。
通常情况下,传感器的实际静态特性输出是条曲线而非直线。在实际工作中,为使仪表具有均匀刻度的读数,常用一条拟合直线近似地代表实际的特性曲线、线性度(非线性误差)就是这个近似程度的一个性能指标。
拟合直线的选取有多种方法。如将零输入和满量程输出点相连的理论直线作为拟合直线;或将与特性曲线上各点偏差的平方和为zui小的理论直线作为拟合直线,此拟合直线称为zui小二乘法拟合直线。
灵敏度是指传感器在稳态工作情况下输出量变化△y对输入量变化△x的比值。
它是输出一输入特性曲线的斜率。如果传感器的输出和输入之间显线性关系,则灵敏度S是一个常数。否则,它将随输入量的变化而变化。
灵敏度的量纲是输出、输入量的量纲之比。例如,某位移传感器,在位移变化1mm时,输出电压变化为200mV,则其灵敏度应表示为200mV/mm。
当传感器的输出、输入量的量纲相同时,灵敏度可理解为放大倍数。
提高灵敏度,可得到较高的测量精度。但灵敏度愈高,测量范围愈窄,稳定性也往往愈差。
分辨率是指传感器可感受到的被测量的zui小变化的能力。也就是说,如果输入量从某一非零值缓慢地变化。当输入变化值未超过某一数值时,传感器的输出不会发生变化,即传感器对此输入量的变化是分辨不出来的。只有当输入量的变化超过分辨率时,其输出才会发生变化。
通常传感器在满量程范围内各点的分辨率并不相同,因此常用满量程中能使输出量产生阶跃变化的输入量中的zui大变化值作为衡量分辨率的指标。上述指标若用满量程的百分比表示,则称为分辨率。分辨率与传感器的稳定性有负相相关性。
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XML-CL35R2S11
XML-C500D2S11
XML-C300E2S11
XML-C300D2S11
XML-C160E2S12
XML-C160D2S11
XML-C070D2S11
XML-C035B2S11
XML-C020B2S11
XML-C010C2S11
XML-C010B2S12
XML-C010B2S11
XML-C004B2S11
XML-C001R2S12
XML-C001R2S11
XML-BS35R2S11
XML-BS10A2S11
XML-BS04B2S11
XML-BS02B2S11
XML-BM05P2C11
XML-BM05A2S11
XML-BM05A2C11
XML-BM03R2S12
XML-BM03R2S11
XML-BM02V2S12
XML-BM02V2S11
XML-BM02V2C11
XML-BM02T2S11
XML-BL35S2S11
XML-BL35R2S12
XML-BL35R2S11
XML-BL35R2C11
XML-BL05R2S11
XML-B500N2S11
XML-B500E2S11
XML-B500D2S11
XML-B500D2C11
XML-B300N2S11
XML-B300N2C11
XML-B300E2S11
XML-B300E2C11
XML-B300D2S12
XML-B300D2S11
XML-B300D2C11
XML-B160N2S11
XML-B160N2C11
XML-B160E2S11
XML-B160D2S12
XML-B160D2S11
XML-B160D2C11
XML-B070N2S11
XML-B070E2S11
XML-B070D2S11
XML-B070D2C11
XML-B035P2S11
XML-B035C2S11
XML-B035C2C11
XML-B035B2S11
XML-B035A2S11
XML-B035A2C11
XML-B020C2S11
XML-B020B2S11
XML-B020B2C11
XML-B020A2S12
XML-B020A2S11
XML-B020A2C11
XML-B010P2S11
XML-B010C2S11
XML-B010B2S12
XML-B010B2S11
XML-B010B2C11
XML-B010A2S12
XML-B010A2S11033
XML-B010A2S11030
XML-B010A2S11028
XML-B010A2S11
XML-B010A2C11
XML-B004C2S11
XML-B004B2S11
XML-B004A2S11
XML-B004A2C11
XML-B002B2S11
XML-B002A2S11
XML-B002A2C11
XML-B001S2S11
XML-B001R2S12
XML-B001R2S11
XML-AM01V2S12
XML-AM01V2S11
XML-AM01V2C11
XML-AM01T2S11
XML-A500N2S11
XML-A500E2S11
XML-A500D2S12
XML-A500D2S11
XML-A500D2C11
XML-A300N2S11
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XML-A300E2C11
XML-A300D2S12
XML-A300D2S11
XML-A300D2C11
XML-A160N2S11
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XML-A160D2S12
XML-A160D2S11
XML-A160D2C11
XML-A070N2S11
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XML-A070E2C11
XML-A070D2S14
XML-A070D2S12
XML-A070D2S11
XML-A070D2C11
XML-A035C2S11
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XML-A035B2S11
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XML-A035A2S12
XML-A035A2S11
XML-A035A2C11
XML-A020C2S12
XML-A020C2S11
XML-A020B2S12
XML-A020B2S11
XML-A020B2C11
XML-A020A2S11
XML-A020A2C14
XML-A020A2C11
XML-A010P2S11
XML-A010P2C11
XML-A010C2S12
XML-A010C2S11
XML-A010C2C11
XML-A010B2S11
XML-A010B2C11
XML-A010A2S13
XML-A010A2S12
XML-A010A2S11
XML-A010A2D11
XML-A010A2C11
XML-A004P2S11
XML-A004C2S11
XML-A004B2S11
XML-A004A2S12
XML-A004A2S11
XML-A004A2C11
XML-A002C2S12
XML-A002C2S11
XML-A002C2C11
XML-A002B2S11
XML-A002A2S12
XML-A002A2S11
XML-A002A2C11
XML-A001S2S11
XML-A001S2C11
XML-A001R2S12
XML-A001R2S11
XML-A001R2C11