Low Temperature Sensors m K Ming xuan XUE

NTD-Ge (Neutron Transmutation Doped) n Lightly doped semiconductor Ge posses most of the needed

NTD-Ge for Bolometers Crystal scintillating bolometer at 10 m. K Pure Ge wafer bolometer

TES (Superconducting Transition Edge Sensors) 超导转变边沿传感器 Ø Single, double, or multiple thin layers of

MMC (Magnetic Metallic Calorimeter) 磁性金属量热计 whose magnetisation is a function of temperature. （磁化率与温度成反比） Au:

Slides: 7

Download presentation

Low Temperature Sensors @m. K Ming xuan XUE

NTD-Ge (Neutron Transmutation Doped) n Lightly doped semiconductor Ge posses most of the needed properties (working at m. K temperature) and it works on Variable Hopping Mechanism at low temperature. (��机制，低温模型 ) n NTD-Ge sensor is preferred due to its high temperature sensitivity, reproducibility, mass production, low specific heat (capacity), fast rise time and simple read out. n The resistivity of a NTD-Ge is given by Mott’s law as,

NTD-Ge for Bolometers Crystal scintillating bolometer at 10 m. K Pure Ge wafer bolometer light detector at 10 m. K Ge thermistor readout light signal Ge thermistor readout thermal signal

NTD-Ge Readout

TES (Superconducting Transition Edge Sensors) 超导转变边沿传感器 Ø Single, double, or multiple thin layers of superconductor and metal films; Ø Material: W, Ti, Mo, Ti/Au, Al/Ti, Mo/Cu, etc. Ø Transition region very narrow in temperature.

MMC (Magnetic Metallic Calorimeter) 磁性金属量热计 whose magnetisation is a function of temperature. （磁化率与温度成反比） Au: Er (铒在低温下是反铁磁性的，在接近绝对零度为强铁磁性，为超导体)