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PekingUniversity定义半导体热敏电阻温度系数 α T, 为温度变化 1℃引起的元件阻值的相对变化率 , 即α =T1 dRTRTdT由 (5.18) 式得 :dR Tb / T= Ae ( − b ) = R ( b )2 T−2dT T T(5.21)(5.22)将 (5.22) 代入 (5.21) 式得 :bαT=−(5.23)2TR T 和 T 为非线性关系 , 其解决办法是通过线性化平衡电桥电路实现线性化测量。2008-11-15 62/119 刘树华
线性化输出平衡电桥 ( 三点补偿式 )PekingUniversity设 : 测温范围在 T 0 和 T 1{R ( T ) = R之间 ,T0 + T1如 10-30℃ 之间变化 , 则令 : R ( )2R ( T ) = R0 01 12008-11-15 63/119 刘树华=Rm10 ℃, T 020 ℃, Tm30 ℃, T 1
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PekingUniversity大气探测学
Page 3 and 4:
§ 5.1 概述PekingUniversity温
Page 5 and 6:
PekingUniversity2. 水的沸点
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PekingUniversity温度尺度绝
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PekingUniversity二、测温方
Page 11 and 12: §5.2 测温元件PekingUniversi
Page 13 and 14: PekingUniversity液体玻璃温
Page 15 and 16: PekingUniversity(1) 水银玻璃
Page 17 and 18: PekingUniversity最高温度表
Page 19 and 20: PekingUniversity最低温度表
Page 21 and 22: 二、双金属片测温元
Page 23 and 24: PekingUniversity双金属片温
Page 25 and 26: PekingUniversity2008-11-15 25/119
Page 27 and 28: 双金属片温度计测温
Page 29 and 30: 双金属片温度计测温
Page 31 and 32: 三、热电偶温度计Peki
Page 33 and 34: PekingUniversity根据导体的
Page 35 and 36: PekingUniversity一种是测定
Page 37 and 38: PekingUniversity热电偶的电
Page 39 and 40: PekingUniversity气象上使用
Page 41 and 42: PekingUniversity使用热电偶
Page 43 and 44: PekingUniversity在大气测温
Page 45 and 46: 2. 金属电阻测温电路P
Page 47 and 48: PekingUniversity当环境温度
Page 49 and 50: PekingUniversity假设 r = r , 则
Page 51 and 52: PekingUniversity(2) 双滑臂测
Page 53 and 54: PekingUniversity其中 Rtmax 和 R
Page 55 and 56: PekingUniversity存在问题 :(1
Page 57 and 58: PekingUniversity将 (5.15a) 式代
Page 59 and 60: PekingUniversity为了使输出
Page 61: PekingUniversity当 T=T 0 时 ,R T
Page 65 and 66: PekingUniversity解上述联立
Page 67 and 68: PekingUniversity由 (1)、(2)、(3)
Page 69 and 70: PekingUniversity将 (4) 式代入
Page 71 and 72: PekingUniversity电位器的数
Page 73 and 74: PekingUniversity一、热滞系
Page 75 and 76: 二、环境温度恒定时
Page 77 and 78: PekingUniversity由 (5.30) 可见
Page 79 and 80: PekingUniversity若温度表示
Page 81 and 82: PekingUniversity例 5: 阿斯曼
Page 83 and 84: PekingUniversity对 (5.33) 求解
Page 85 and 86: PekingUniversity求 (5.37) 式齐
Page 87 and 88: PekingUniversity当 τ = 0,T = T 0T
Page 89 and 90: PekingUniversity例 : 百叶箱
Page 91 and 92: PekingUniversity§5.4 气温测
Page 93 and 94: 气温测量中的防辐射
Page 95 and 96: 5.4.1 百叶箱PekingUniversity
Page 97 and 98: 百叶箱PekingUniversity高 537
Page 99 and 100: 5.4.2 通风干湿表PekingUniv
Page 101 and 102: 5.4.3 防辐射罩PekingUniversi
Page 103 and 104: 微气象观测系统PekingUn
Page 105 and 106: PekingUniversity(2) 直管地温
Page 107 and 108: PekingUniversity2008-11-15 107/119
Page 109 and 110: PekingUniversity(5) 深层地温
Page 111 and 112: PekingUniversity§5.6 声雷达
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PekingUniversity2008-11-15 113/119
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§5.6 复习思考题PekingUniv
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