??? ??????? Temperature Coefficient of Resistance

1
??????????Temperature Coefficient of Resistance
2
????(object)

• ???????????,?????????????????????,???????????????
• ???(copper)????????
• ??NTC(?????negative temperature
  coefficient)????(thermister)????????
• ???(copper)?NTC(?????negative temperature
  coefficient)????(thermister)????????????

3
????(theory)

• ????,?????(electric conductor)???(resistance
  value)????????
• (1) ????(free carrier)???????(crystal
  lattice)?????(????)?
• (2) ????????????(????)?

4
????(metal conductor)

• ????(metal conductor)?????????,?????(free
  electron)???,??????,????????????,????????????(drif
  t)????????????,??????,??????,??????????????,??????
  ???????

5
???????

• ???????????????
• R(T)R0?1a(T-T0)?(1)
• ??
• R(T)?????T?????
• R0???T0?????
• a?????T0????????

6
????

• ????
• (1)?????????????,???????,???????,?????(valence)???
  ?,?????????????
• ??
• (????????????)
• (2)??????(metal ion),???????,???????,???????(?????
  ??????????),??????????,

7
????

• ????
• (3)???????????T?,????????
• ..(2)
• ??
• R(T)?????????T????
• R0?????????298.2 K(25?)
• T0????298.2 K
• a?????????

8
????

• ????
• (4)???(2)???ln?,?
• ...............(3)
• (?YY0aX??)
• ???????ln?,??????????????,????????a??

9
????

• ????
• (5)????????,????????-50??350???,?
  ?????????(initial resistance)?R0,????????a ?

10
?????

• ?????(Kelvin double bridge)???????,???????????????
  ,??????????????,?18???,??Rx??????,VR (Rv)???????

11

• ????????,??Test?,??????0,??????Rx??
• Rx?? Rv
• ??

12
?? ??(method)

• ?????,???????????,?????????????????
• ???????,???????????,?????????,????????????????????
  ?????????,?????????????,???????(multimeter)???,???
  ????

13
??????(notes)

• ??????????,???(?)?????????
• ????????????,???????????????????(???)???

14
???????

• ?????????????,????????????????????
• ??????????????????