On the development of a transparent enclosure for 360° video cameras to observe severe fires in situ

Hoehler, Matthew S.

doi:10.1016/j.firesaf.2020.103024

Cited by 5 publications

(4 citation statements)

References 15 publications

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“…(12). To prevent thermal damage to the video camera, the intended dimensionless operating period should be less than or equal to the dimensionless time t  when 1 1 Q  on heating up the spherical enclosure for constant V  and constant τ since same 1 Q  can be obtained by varying either 1 Q  or V  . In this case, the results will determine how long a given spherical enclosure (known τ, V  ) can be safely used to protect the video camera from thermal damage in a fire scenario specified by 1 Q  .…”

Section: Resultsmentioning

confidence: 99%

“…The Burn Observation Bubble (known as its acronym BOB) is a device which consists of a commercially available off-the-shelf digital 360° view waterproof camera inside a transparent glass sphere filled with flowing water. The device, which was conceived, designed, and constructed by Hoehler [1] of NIST, is intended to be used to observe fire dynamics behavior inside a fire in laboratories and fields. The functions of the water are to cool the camera and to absorb infrared radiation from the intense fire, reducing camera pixel saturation for better video quality.…”

Section: Introductionmentioning

confidence: 99%

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On the cooling of a 360� video camera to observe fire dynamics in situ

Yang¹

2019

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An analysis was performed to provide design guidance on the cooling of an NIST-developed in situ fire visualization device, called Burn Observation Bubble (BOB). The analysis was to address the question of how long the device can operate in a fire without being damaged by the fire. The analysis included consideration of single-pass and recirculating cooling systems. The resulting design equations depend on the fire scenario, the cooling water flow rate, and the volume ratio of the device volume to recirculating cooling water reservoir. In the limit of an infinite recirculating cooling water reservoir, the design equations reduce to those of a single-pass system. Sample calculations were given to illustrate the applicability of the equations.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On the cooling of a 360� video camera to observe fire dynamics in situ

Yang¹

2019

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“…Unlike the other setup, the 360° system is a pressurized (closed) around the camera. Details about the functionally and fabrication of this system are provided by Hoehler [38]. A cardioid condenser microphone with thermal protection (25 mm or less of either Aramid fabric or thermal ceramic fiber blanket covered in a silver thermal radiation reflecting scrim) was mounted low on the south wall near the front opening (see Fig.…”

Section: Video Camerasmentioning

confidence: 99%

Full-Scale Experiments to Demonstrate Flammability Risk of Residential Upholstered Furniture and Mitigation Using Barrier Fabric

Zammarano¹,

Hoehler²,

Shields³

et al. 2020

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“…The water served the dual purposes of cooling the camera and filtering out the infrared thermal radiation produced by the fire that would otherwise damage the camera's imaging sensor. This concept was later developed to house 360° cameras as described by Hoehler [10].…”

Section: Video Camerasmentioning

confidence: 99%