| Author(s): |
Alessio Pollarolo; Chiharu Urano; Paul D. Dresselhaus; Jifeng Qu; Horst Rogalla; Samuel P. Benz; |
| Title: |
Development of a Four-channel System for Johnson Noise Thermometry |
| Published: |
December 30, 2010 |
| Abstract: |
Long integration time is necessary to reach low uncertainty when measuring temperature through Johnson Noise Thermometry (JNT). The main goal of the NIST JNT experiment is to achieve a 6×10-6 relative uncertainty in the measurement of the water triple point, which could contribute to the re-determination of Boltzmann's constant. A four-channel JNT system, which will reduce the measurement time two-fold, is being developed with new components, including a switchboard, an analog to digital converter (ADC) and a programmable, recharging power supply system. While implementing the new ADC, a source of systematic error was revealed, as well as a means to increase the measurement bandwidth. |
| Citation: |
IEEE Transactions on Instrumentation and Measurement |
| Volume: |
60 |
| Issue: |
7 |
| Pages: |
pp. 2655 - 2659 |
| Keywords: |
Boltzmann s equation, correlation, digital analog conversion, Josephson arrays, measurement units, noise measurement, quantization, signal synthesis, standards, temperature. |
| Research Areas: |
Quantum Electrical Measurements, Johnson Noise Thermometry, Superconducting Electronics |
| PDF version: |
 Click here to retrieve PDF version of paper (384KB) |
