A sub-nanosecond pyrometer with broadband spectral channels for temperature measurement of dynamic compression experiments

Wu, Jian; Li, Jiabo; Li, Jun; Zhou, Xianming; Weng, Jidong; Liu, Shenggang; Tao, Tianjiong; Ma, Heli; Tang, Longhuang; Gao, Zhipeng; Wang, Xiang; Tao, Peidong

doi:10.1016/j.measurement.2022.111147

Cited by 4 publications

(1 citation statement)

References 33 publications

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“…The spatial resolution of this method depends on the size of the laser spot exciting the sample [6]. Two-color fiber-optic pyrometry, in addition to allowing rapid acquisition [7], high spatial resolution [8], and precision [9], can be used in environments with difficult access and in extreme conditions, highlighting designs without discrete optics that limit their performance [10]. A fiber-optic pyrometer allows temperature measurements without considering the effect of emissivity if at least two spectral bands are used, as in two-color fiber-optic pyrometers.…”

Section: Introductionmentioning

confidence: 99%

Influence of Tilting Angle on Temperature Measurements of Different Object Sizes Using Fiber-Optic Pyrometers

Vargas,

Tapetado,

Vázquez

2023

Sensors

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This article presents a new model of optical power gathered by a fiber-optic pyrometer when there is a tilting angle between the fiber longitudinal axis and the vector perpendicular to the tangent plane of the emitted surface. This optical power depends on the fiber specifications, such as the diameter and the numerical aperture (NA), as well as the object parameters, including its diameter, emissivity, and tilting angle. Some simulations are carried out using other pyrometers from the literature without tilting to validate the model. Additional simulations with different optical fibers, object sizes, and distances at different tilting angles allow us to describe the behavior of the pyrometer when the object is smaller than the optical fiber field of view (the light cone defined by its NA). The results show that for a finite surface object, the power collected by the optical fiber is affected by changes in the tilting angle, greater tilting lesser gathered power, and reaching the maximum power when the field of view of the fiber covers up the entire object, as expected. On the other hand, additional equations are presented to describe the maximum tilting angle, and distance that allow the maximum power gathered for a determined object diameter and fiber, avoiding temperature measurement errors.

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Section: Introductionmentioning

confidence: 99%

Influence of Tilting Angle on Temperature Measurements of Different Object Sizes Using Fiber-Optic Pyrometers

Vargas,

Tapetado,

Vázquez

2023

Sensors

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Establishing calibration-free pyrometry in reactive systems and demonstrating its advanced capabilities

Jaramillo,

Ritchie,

Pantoya

et al. 2023

Applications in Energy and Combustion Science

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High-Speed Infrared Radiation Thermometer for the Investigation of Early Stage Explosive Development and Fireball Expansion

Hobbs

Barr

Woolford

et al. 2022

Sensors

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The understanding of blast loads is critical for the development of infrastructure that protects against explosions. However, the lack of high-quality experimental work on the characterisation of such loads prevents a better understanding of many scenarios. Blast loads are typically characterised by use of some form of pressure gauge, from which the temperature can be inferred from a pressure measurement. However, such an approach to temperature measurement is limited; it assumes ideal gas laws apply throughout, which may not be the case for high temperature and pressure scenarios. In contrast, infrared radiation thermometers (IRTs) perform a measurement of temperature based upon the emitted radiance from the target object. The IRTs can measure fast changes in transient temperature, making them seemingly ideal for the measurement of a fireball’s temperature. In this work, we present the use of a high-speed IRT for the measurement of early-stage explosive development and fireball expansion within a confined blast, with the temperature of the explosive fireball measured from its emitted radiance. The temperature measured by the IRT was corroborated against the temperature inferred from a pressure gauge measurement; both instruments measured the same temperature from the quasi-static pressure (QSP) point onwards. Before the QSP point, it is deduced that the IRT measures the average temperature of the fireball over a wide field-of-view (FOV), as opposed to that inferred from the singular shocks detected by the pressure gauge. Therefore, use of an IRT, in tandem with a pressure gauge, provides a potential invaluable measurement technique for the characterisation the early stages of a fireball as it develops and expands.

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A sub-nanosecond pyrometer with broadband spectral channels for temperature measurement of dynamic compression experiments

Cited by 4 publications

References 33 publications

Influence of Tilting Angle on Temperature Measurements of Different Object Sizes Using Fiber-Optic Pyrometers

Influence of Tilting Angle on Temperature Measurements of Different Object Sizes Using Fiber-Optic Pyrometers

Establishing calibration-free pyrometry in reactive systems and demonstrating its advanced capabilities

High-Speed Infrared Radiation Thermometer for the Investigation of Early Stage Explosive Development and Fireball Expansion

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