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第七章 热电偶传感器 PowerPoint PPT Presentation


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电气信息学院. 第七章 热电偶传感器. 介绍: 热电偶属电量传感器 ( 将非电量转换为电量 T —— mV) ,有源传感器。 一 . 热电偶测温的基本原理 1 、热电效应: 将两种不同的导体或半导体连接成闭合回路 , 如果将两个接点分别置于温度各为 T 及 T O ( T>T O )的热源中,则在该回路内就会产生热电动势(接触电势和温差电势)。. T>T O. 热端. 冷端. 2 、接触热电势. 由于两种材料电子密度不同(如 N A >N B ),其电子在两个方向上的扩散速度就不同,在 A 、 B 的接触面上便形成了一个从 A 到 B 的静电场 E 。

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第七章 热电偶传感器

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6319123


6319123

(TmV)

.

1,TTO T>TO

T>TO


6319123

2

NA>NBABABE

EAB

AB

>

e

E

NA>NB


6319123

3

E

.,


6319123

4

A

B


6319123

5NA NBTTO TTO

T0

T


6319123

.

1,,

2,T=T0,AB

3ABAB


6319123

1.

ABT1T3 T1T2T2T3

A

B


6319123

2.:

A

A

t2

mV

C

t1

B

t2

C

B


6319123

3.:

T1T2ABACCB

EABT1,T2=EAC T1,T2 +ECB T1,T2

EABT1,T2=EAC T1,T2 -EBC T1,T2

T1

T1

T1

A

B

A

C

C

B

T2

T2

T2

C


6319123

100

100

100

T1

T1

2.95mV

4.0mV

A

A

C

C

B

B

T2

T2

T2

EABT1,T2=EAC T1,T2 EBC T1,T2

EAB T1,T2 2.95mV-(-4.0mV)=6.95mV


6319123

1.

198811IECSBEKRJTR13-S10-,


6319123

30-6

WRR

LL-2

B

01800

8004.0

>800

0.5%t

10-

WRP

LB-3

S

01600

6003.0

>600

0.5%t

-

WRN

EU-2

K

01300

4003.0

>400

0.75%t

--

WRKWRE

EA-2

E

080001000

3003.0

>300

1.0%t


6319123

S/R

3000C

T

-1602500C

/K

10/13


6319123

1


6319123

1

2

3

2

1 ; 2; 3

(b)

(a)


6319123


6319123

4

1

3

2

3

(0.010.lm)

, 6060.2mm; 300ms

1; 2;

3; 4


6319123

0


6319123

1

A

T

B

mV

T0


6319123

n

2

E300,30,?

?


6319123

280

E280,30,?


6319123

1

A

T

B

mV

T0


6319123

3


6319123

:

U= ETT0+(UTU3)

RS

R2

R1

A

B

I1

I2

E

Rcu

R3

U

T0

T0

+

T


6319123

1

20.520


6319123

80

1A/0K 1V/0K

LM134 1A/0K -551250C


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