Dynamic back face deformation measurement with a single optical fibre

Seng, Frederick; Hackney, Drew; Goode, Tyler; Noevere, Alexander; Hammond, Alec M.; Velasco, Ivann; Peters, Kara; Pankow, Mark; Schultz, Stephen M.

doi:10.1016/j.ijimpeng.2020.103800

Cited by 6 publications

(6 citation statements)

References 21 publications

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“…This work builds on the algorithm from previous work to allow for high dynamic BFD sensing with a single FBG [18]. In this previous the dynamic system can be modeled as a spring.…”

Section: Force and Friction Relationshipmentioning

confidence: 99%

“…Previous work demonstrated that strain induced on the FBG under a ballistic impact is directly proportional to the deceleration of the BFD over time. The proportionality is determined using the impact velocity [18]. This relationship is accurate if the optical fibre remains in the slipping regime with F fibre < F friction .…”

Section: Slipping Equivalent Strain Reconstructionmentioning

confidence: 99%

“…However, the nichrome wire measurement technique measures the strain along the entire length of the wire rather than at a discrete location. Further work localized the strain measurement using optical fibre with a single fibre Bragg grating (FBG) sensor attached to Kevlar fabric to measure the strain [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

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Dynamic measurement of ballistic impact using an optical fibre sensor

Velasco,

Seng,

Hodges

et al. 2024

Smart Mater. Struct.

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An optical fibre-based sensor is developed for measuring the dynamics of the back face deformation of soft body armor. The measurement system consists of embedding an optical fibre into a thin silicone mat to increase survivability. The silicone sensor mat is placed between the soft body armor and the backing material. The optical fibre experiences times of sticking and slipping. The portions of the impact with the optical fibre stuck are reconstructed into slipping-equivalent strain using exponential extrapolation from adjacent slipping portions. The strain on the optical fibre is related to the projectile acceleration when the optical fibre is slipping. The strain is measured with the optical fibre sensor using a fibreBragg grating. The system is characterized using a gas gun in combination with high-speed imaging. The system is experimentally demonstrated at the Army Test Center in Aberdeen, MD. Of the 23 shots 17 had an error less than 10%.

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“…This work builds on the algorithm from previous work to allow for high dynamic BFD sensing with a single FBG [18]. In this previous the dynamic system can be modeled as a spring.…”

Section: Force and Friction Relationshipmentioning

confidence: 99%

Section: Slipping Equivalent Strain Reconstructionmentioning

confidence: 99%

See 1 more Smart Citation

Dynamic measurement of ballistic impact using an optical fibre sensor

Velasco,

Seng,

Hodges

et al. 2024

Smart Mater. Struct.

Self Cite

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“…To achieve this, on‐body sensors are the most commonly used technology at present, and they can be found in fields as healthcare applications, [ 1,2 ] physical training, [ 3 ] emergency rescue service, and law‐enforcement. [ 4 ] Nevertheless, smart textile developments are leading to the appearance of new applications beyond on‐body sensors such as gas detection, [ 5 ] ballistics, [ 6 ] or structural deflection detection. [ 7 ] Latest advances are introducing energy harvesting methods on textile sensors to obtain power from other source, which typically are batteries.…”

Section: Introductionmentioning

confidence: 99%

“…beyond on-body sensors such as gas detection, [5] ballistics, [6] or structural deflection detection. [7] Latest advances are introducing energy harvesting methods on textile sensors to obtain power from other source, which typically are batteries.…”

mentioning

confidence: 99%

A Full Textile Capacitive Woven Sensor

Martínez-Estrada

Ventura

Gil

et al. 2022

Adv Materials Technologies

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In this paper, a full textile capacitive woven sensor integrated over a textile substrate is presented. The sensor consists in an interdigitated capacitance prepared to measure moisture and/or presence detection. In order to evaluate the sensor response to moisture, capacitance has been measured by means of an LCR meter from 20 Hz to 20 kHz in a climatic chamber with a swept of the relative humidity (RH) from 30% to 90% at 20 °C. Subsequently, presence response is evaluated measuring the capacitance of the woven sensor meanwhile a person is sitting down and getting up. The woven sensor results demonstrate its functionality over moisture measurement where sensor capacitance changes from a minimum of 9.74 pF at 30% RH to a maximum of 2.31 uF at 90% RH. The presence detection is also demonstrated, which makes the capacitance variation change from a 10% of capacitance variation when the chair is empty, to a capacitance variation of 170% when a person is sitting on it. The adaptation of the weaving process to accomplish a fully integrated sensor provides a better repeatability than previous embroidered sensors and opens a door to being commercially produced.

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