Related Experiment Video
Updated: May 18, 2026
06:33
Method for Simultaneous fMRI/EEG Data Collection during a Focused Attention Suggestion for Differential Thermal Sensation
Published on: January 5, 2014
Note: a versatile, stable, high-resolution readout system for RTD and thermistor sensors
R Ambrosetti1, E Matteoli, D Ricci
1IPCF-CNR, Istituto per i Processi Chimico-Fisici del CNR, UoS di Pisa, via G. Moruzzi, 1, 56124 Pisa, Italy.
The Review of Scientific Instruments
|October 2, 2012
Summary
This study presents a novel readout system for resistance temperature detectors and thermistors, achieving superior temperature resolution below 1 mK. The system demonstrates high stability and adaptability for various sensor types and excitation currents.
Area of Science:
- Instrumentation
- Metrology
- Sensor Technology
Background:
- Accurate temperature measurement is crucial in various scientific and industrial applications.
- Existing readout systems for resistance temperature detectors (RTDs) and thermistors often face limitations in resolution and adaptability.
- Minimizing temperature coefficient (TC) and ensuring long-term stability are key challenges in high-precision thermometry.
Purpose of the Study:
- To develop and characterize a high-resolution readout system for RTDs and thermistors.
- To demonstrate the system's capability to accommodate sensors with diverse resistance values and excitation current requirements.
- To evaluate the system's temperature resolution, stability, and temperature coefficient.
Main Methods:
- Design and implementation of a versatile readout system for temperature sensors.
- Characterization of system performance using a 100 Ω Platinum (Pt) sensor equivalent.
- Measurement of temperature resolution, temperature coefficient (TC), and long-term stability under thermostated conditions.
Main Results:
- Achieved temperature resolution better than 1 mK.
- Demonstrated a system resolution of 0.38 mK with a 100 Ω Pt sensor at 0.7 mA excitation current and 1 Hz reading rate.
- Exhibited a low temperature coefficient (TC) of 0.26 mK/K, which can be made negligible through self-temperature control.
- Attained overall system stability better than 10 ppm over 230 hours when thermostated.
Conclusions:
- The developed readout system offers exceptional temperature resolution and stability for RTDs and thermistors.
- Its adaptability to different sensor characteristics enhances its utility across various applications.
- The system's low TC and high long-term stability make it suitable for demanding precision thermometry tasks.
Related Concept Videos
01:22Thermometers and Temperature Scales
Any physical property that depends consistently and reproducibly on temperature can be used as the basis of a thermometer. For example, volume increases with temperature for most substances. This property is the basis for the common alcohol thermometer and the original mercury thermometers. Other properties used to measure temperature include electrical resistance, color, and the emission of infrared radiation.
As many physical properties depend on temperature, the variety of thermometers is...
As many physical properties depend on temperature, the variety of thermometers is...
01:14Temperature 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...
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...
01:13Equipments 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,...
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,...
01:43Thermosensation
Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...
01:06Potentiometry: Overview
Potentiometry is an analytical technique that measures the potential difference between two electrodes in an electrochemical cell without drawing any significant current that could alter the solution's composition. This method employs an indicator electrode, which exchanges electrons with the analyte solution, and a reference electrode with a constant potential. Each electrode is immersed in a solution comprised of two half-cells. In a conventional setup, the reference electrode serves as the...
01:15High-Performance Liquid Chromatography: Types of Detectors
The role of the detectors in High-Performance Liquid Chromatography (HPLC) is to analyze the solutes as they exit from the chromatographic column. The detector recognizes the solute's property and generates corresponding electrical signals, which are converted into a readable graph of the detector's response versus elution time called a chromatogram at the computer. There are several types of HPLC detectors, each with its own advantages and limitations, depending on the analyte properties and...