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Related Concept Videos

Temperature Measurement Sites01:14

Temperature Measurement Sites

A thermometer measures body temperature. The common sites for measuring body temperature are the oral cavity, axillary region, temporal artery, and skin surface, such as the forehead, abdomen, and axilla. True core body temperature is assessed in the rectum, tympanic membrane, pulmonary artery, esophagus, and urinary bladder.
Oral: When assessing oral temperature, the thermometer tip should be placed under the tongue in the posterior sublingual pocket. It offers accurate readings and can be...
Equipments Used to Measure Body Temperature01:13

Equipments Used to Measure Body Temperature

Body temperature can be assessed using various devices and measured in Celsius or Fahrenheit.
Glass-bulb Thermometer:
Glass-bulb thermometers are hollow glass tubes with a bulb tip containing liquid such as ethanol or mercury. Historically, glass bulb mercury thermometers were the standard device to measure body temperature. Today, mercury thermometers are prohibited in many countries due to the hazardous effects of mercury and the risk of exposure if the glass bulb breaks. In general,...
Non-ohmic Devices00:51

Non-ohmic Devices

In most substances, the current flow is proportional to the voltage applied to it. A simple relationship between the values of current, voltage, and resistance is known as Ohm's law. Nonohmic devices do not exhibit a linear relationship between voltage and current. One such device is the semiconducting circuit element known as a diode. A diode is a circuit device that allows current flow in only one direction.
Consider a simple circuit consisting of a battery, a diode, and a resistor. A diode...
Constant Pressure Calorimetry03:02

Constant Pressure Calorimetry

Calorimetry is a technique used to measure the amount of heat involved in a chemical or physical process or to measure the heat transferred to or from a substance. The heat is exchanged with a calibrated and insulated device called the calorimeter. Calorimetry experiments are based on the assumption that there is no heat exchange between the insulated calorimeter and the external environment. The well-insulated calorimeters prevent the transfer of heat between the calorimeter and its external...

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Compact low-temperature fixed point device.

M Steinback1, D Matsumoto, A C Anderson

  • 1Department of Physics and Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.

The Review of Scientific Instruments
|February 1, 1979
PubMed
Summary
This summary is machine-generated.

A novel fixed point device, designed for permanent mounting on dilution refrigerators, accurately measures temperatures using Beryllium (Be) and Indium (In) transitions. This device enables precise low-temperature calibration in cryogenics research.

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Area of Science:

  • Low-temperature physics
  • Cryogenics
  • Materials science

Background:

  • Accurate temperature measurement is crucial for scientific experiments at millikelvin and kelvin temperatures.
  • Dilution refrigerators are standard equipment for achieving ultra-low temperatures.
  • Existing calibration methods can be complex or require specialized setups.

Purpose of the Study:

  • To develop and present a compact, permanently mounted fixed point device for dilution refrigerators.
  • To utilize well-characterized Beryllium (Be) and Indium (In) phase transitions for temperature calibration.
  • To provide a reliable and accessible temperature reference in the 25 mK to 3.4 K range.

Main Methods:

  • Design and fabrication of a small, fixed-point device.
  • Integration of the device into a dilution refrigerator.
  • Characterization of the Beryllium (Be) transition near 25 mK.
  • Characterization of the Indium (In) transition near 3.4 K.

Main Results:

  • Successful permanent mounting of the fixed point device on a dilution refrigerator.
  • Observation of the Beryllium (Be) superconducting transition at approximately 25 mK.
  • Observation of the Indium (In) superconducting transition at approximately 3.4 K.
  • Demonstration of the device's capability for low-temperature calibration.

Conclusions:

  • The developed fixed point device offers a practical solution for in-situ temperature calibration in dilution refrigerators.
  • The device leverages reliable superconducting transitions of Beryllium and Indium for accurate measurements.
  • This technology enhances the precision and reproducibility of experiments conducted at ultra-low temperatures.