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Related Concept Videos

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,...
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...
Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

Design Example: Strain Gauge Bridge or Wheatstone Bridge

The utilization of strain gauges as transducers for converting mechanical strain into electrical signals is a common practice in various engineering applications. These strain gauges are frequently integrated into Wheatstone bridge circuits to accurately measure parameters such as force or pressure. Within this context, each element within the circuit exhibits a resistance that undergoes subtle variations when subjected to mechanical strain. The primary objective is to convert minuscule...
Gas Thermometers and the Kelvin Scale01:22

Gas Thermometers and the Kelvin Scale

The definition of temperature in terms of molecular motion suggests that there should be a lowest possible temperature, where the average kinetic energy of molecules is zero (or the minimum allowed by quantum mechanics). Experiments confirm the existence of such a temperature, called absolute zero. An absolute temperature scale is one whose zero point is absolute zero. Such scales are convenient in science because several physical quantities, such as the volume of an ideal gas, are directly...
Temperature Dependent Deformation01:12

Temperature Dependent Deformation

In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added together...
Pressure Gauges01:20

Pressure Gauges

Most pressure gauges, like those on scuba tanks, are calibrated to read zero at atmospheric pressure. Readings from such gauges are called the gauge pressure, which is the pressure relative to atmospheric pressure. When the pressure inside the tank exceeds atmospheric pressure, the gauge reports a positive value. Some gauges are designed to measure negative pressure. For example, many physics experiments must take place in a vacuum chamber, a rigid chamber from which some of the air is pumped...

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Related Experiment Video

Updated: Jun 16, 2026

A Simple Dewar/Cryostat for Thermally Equilibrating Samples at Known Temperatures for Accurate Cryogenic Luminescence Measurements
06:06

A Simple Dewar/Cryostat for Thermally Equilibrating Samples at Known Temperatures for Accurate Cryogenic Luminescence Measurements

Published on: July 19, 2016

Dewar design for temperature tuned SHG.

K G Spears, L Hoff Land, R Loyd

    Applied Optics
    |February 20, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A new dewar design enables wide temperature range operation for second-harmonic generation (SHG) applications, suitable for ADP, ADA, and RDP crystals. A simple proportional temperature controller schematic is also provided.

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    Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor

    Published on: August 30, 2012

    Area of Science:

    • Crystallography
    • Optical Physics
    • Cryogenics

    Background:

    • Second-harmonic generation (SHG) is a nonlinear optical process crucial for frequency conversion.
    • Maintaining stable and wide temperature ranges is essential for optimizing SHG crystal performance.
    • Existing dewar systems may have limitations in temperature range or applicability to specific nonlinear crystals.

    Purpose of the Study:

    • To present a novel dewar design optimized for wide temperature range operation in SHG applications.
    • To demonstrate the dewar's utility with ammonium dihydrogen phosphate (ADP), ammonium dihydrogen arsenate (ADA), and rubidium dihydrogen phosphate (RDP) crystals.
    • To provide a schematic for a simple, effective proportional temperature controller for the dewar system.

    Main Methods:

    • Design and fabrication of a specialized dewar apparatus.
    • Integration of the dewar with ADP, ADA, and RDP crystals for SHG experiments.
    • Development and implementation of a proportional temperature control system.

    Main Results:

    • The designed dewar successfully facilitated SHG applications across a wide temperature spectrum.
    • The dewar proved compatible with ADP, ADA, and RDP nonlinear optical crystals.
    • The proportional temperature controller maintained stable operating conditions.

    Conclusions:

    • The developed wide temperature range dewar is a versatile and effective platform for SHG research.
    • The design advances the capability to study temperature-dependent nonlinear optical properties of various crystals.
    • The integrated temperature controller simplifies experimental setup and enhances reliability.