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Fabrication and Testing of Photonic Thermometers

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Simple bridge detector for use with a low-temperature capacitance thermometer, and thermometer performance limits.

¹Gordon McKay Laboratory and Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.

The Review of Scientific Instruments

|March 1, 1979

Summary

A novel bridge circuit enhances glass-ceramic capacitance thermometers, achieving sub-millikelvin resolution. This circuit partially corrects for thermometer calibration drift, improving measurement accuracy.

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Area of Science:

Physics
Materials Science
Instrumentation

Background:

Capacitance thermometers, particularly glass-ceramic types, are valuable for precise temperature measurements.
Existing bridge circuits may face limitations in resolution and stability.
Thermometer calibration can drift with thermal cycling, affecting accuracy.

Purpose of the Study:

To describe a simple, high-resolution bridge circuit for glass-ceramic capacitance thermometers.
To evaluate the performance limits of the thermometer and the developed circuit.
To investigate the circuit's ability to compensate for calibration shifts.

Main Methods:

Development of a high-resolution bridge circuit.
Integration and testing with a glass-ceramic capacitance thermometer.
Characterization of resolution, short-term stability, and calibration reproducibility.
Analysis of calibration slope (dC/dT) changes.

Main Results:

The bridge circuit provides a linear readout of capacitance changes.
Achieved resolution better than 1 millikelvin (mK) with excellent short-term stability.
Observed thermometer calibration irreproducibility up to 0.3 K upon thermal cycling.
Demonstrated partial compensation for shifts in the calibration slope (dC/dT).

Conclusions:

The developed bridge circuit offers a significant improvement in high-resolution thermometry.
The circuit partially mitigates calibration drift issues inherent in glass-ceramic thermometers.
This advancement is crucial for applications requiring stable and accurate low-temperature measurements.