Custom Helmet Dewar
Custom Helmet Dewar - Related Videos
07:30
A Test Bed to Examine Helmet Fit and Retention and Biomechanical Measures of Head and Neck Injury in Simulated Impact
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Cited by 8 •
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Using an anthropometric head and neck, optical fiber-based fit force transducers, an array of head acceleration and neck force/moment transducers, and a dual high speed camera system, we present a test bed to study helmet retention and effects on biomechanical measures of head and neck injury secondary to head impact.
14:15
Measurement Of Neuromagnetic Brain Function In Pre-school Children With Custom Sized MEG
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06:06
A Simple Dewar/Cryostat for Thermally Equilibrating Samples at Known Temperatures for Accurate Cryogenic Luminescence Measurements
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2016
A simple liquid nitrogen Dewar/cryostat apparatus comprised of a small fused silica optical Dewar, a thermocouple, and a charge-coupled device (CCD) spectrograph are described. The experiments for which this Dewar/cryostat is designed require fast sample loading, freezing, and alignment, accurate and stable sample temperatures, and small size/portability.
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FAQs
The evacuated space between the vessel’s walls limits conductive and convective heat transfer. By reducing heat exchange with the surroundings, it helps the apparatus maintain a more controlled thermal environment around the head. This insulation supports repeatability because changing external heat flow can alter cooling stability during a biological experiment.
The selected cryogen primarily determines available cooling capacity and contributes to temperature stability. Helmet geometry also affects how the cold region is positioned near the head and whether the apparatus fits the intended subject or setup. These variables must be considered together, rather than treating insulation as the only determinant of performance.
Localized cooling allows researchers to impose thermal conditions near a target region without necessarily changing the temperature of the entire surrounding system. In biology, this supports experiments involving temperature-sensitive tissues and neural physiology, where controlled, repeatable exposure can be important for interpreting responses. The helmet’s geometry determines how closely that region is positioned.
A practical setup begins with selecting a cryogen suited to the desired cooling capacity and temperature stability. The operator then uses the intended helmet geometry, confirms that the vessel fits the experimental arrangement, and controls containment and insulation before use. These checks help produce localized conditions consistently across experiments.
Depending on the research design, a Custom Helmet Dewar can support localized cooling studies of temperature-sensitive tissues, investigations of neural physiology, or cryogenic sample handling. Its value lies in creating a controlled and repeatable thermal condition near the relevant biological material. Researchers can therefore use it when spatially focused cooling is needed.
Because the apparatus places cryogenic material around or near the head, containment and insulation are essential design requirements. They help keep the cryogen where intended and reduce unwanted heat exchange with the surroundings. Operator-safety requirements must be controlled alongside temperature and fit so biological experiments can maintain the intended localized-cooling configuration.