LED-based field radiometer for sensor web in-situ measurements

Taralli, E.; Filippo, Roberto; Brida, G.; Rajteri, M.; Hall, Simon R. G.; Białek, Agnieszka; Greenwell, Claire; Fox, Nigel

doi:10.1109/metroaerospace.2015.7180675

Cited by 2 publications

(5 citation statements)

References 8 publications

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“…LEDs are highly sensitive to their emission spectra (Mims 1992, Tymecki et al 2009, Bui and Hauser 2013, Taralli et al 2015. Therefore, a PEDD strip configuration with cold white as both the emitter and detector yielded the highest signal, as observed in figure 4(a).…”

Section: Intensifying Screen Selectionmentioning

confidence: 92%

Development and characterization of an LED-based detector for dosimetry in diagnostic radiology

Damulira¹,

Yusoff²,

Omar³

et al. 2021

Phys. Med. Biol.

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Light-emitting diodes (LEDs) could be a potential dosimetry candidate because they are radiation hard, spectrally selective, direct band gap, and low-cost devices. Thus, an LED-based detector prototype was designed and characterized for dosimetry. A 20 × 20 cm2 array of surface mount device LED chips was sandwiched in photovoltaic mode between two intensifying screens to form a dosimetric system. The system was enclosed in a light-tight air cavity using black vinyl tape. The screens converted diagnostic x-ray beams into fluorescent blue light. LEDs, applied in detector mode, converted the fluorescent light into radiation-induced currents. A digital multimeter converted the analog currents into digital voltage signals. Prototype characterization was executed using (a) IEC 61267’s RQR 7 (90 kVp) and RQR 8 (100 kVp) beam qualities, and (b) low (25 mAs) and high (80 mAs) beam quantities. A standard dosimeter probe was simultaneously exposed with the prototype to measure the prototype’s absorbed dose. In all exposures, the x-ray beams were perpendicularly incident on both the dosimeter and prototype, at a fixed source to detector distance-60 cm. The LED array prototype’s minimum detectable dose was 0.139 mGy, and the maximum dose implemented herein was ∼13 mGy. The prototype was 99.18% and 98.64% linearly sensitive to absorbed dose and tube current–time product (mAs), respectively. The system was ±4.69% energy, ±6.8% dose, and ±7.7% dose rate dependent. Two prototype data sets were 89.93% repeatable. We fabricated an ultrathin (5 mm), lightweight (130 g), and a relatively low-cost LED-based dosimetric prototype. The prototype executed a simple, efficient, and accurate real-time dosimetric mechanism. It could thus be an alternative to the current passive dosimetric systems.

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Section: Intensifying Screen Selectionmentioning

confidence: 92%

Development and characterization of an LED-based detector for dosimetry in diagnostic radiology

Damulira¹,

Yusoff²,

Omar³

et al. 2021

Phys. Med. Biol.

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show abstract

“…In a radiation sensor, often a matched source of radiation is also needed to excite a physical phenomenon (as, for example, in [ 21 ]), with reference purpose (as in [ 18 ]), or for other use [ 24 , 25 ]. For this reason, we examined the emission properties of many LEDs.…”

Section: Leds As Radiation Sourcesmentioning

confidence: 99%

“…As a practical example, Figure 6 shows four matched source-detector LED couples that were chosen for our realization of a self-calibrating radiometer based on LEDs used both as radiation-detecting devices and reference sources for the calibration [ 18 , 19 ].…”

Section: Matching Of Source and Detector Ledsmentioning

confidence: 99%

“…This property is particularly interesting because it allows them to be selective in bandwidth without any dispersive or absorbing element, with great advantages from the physical dimension and cost point of view. There are already applications in radiometry in which LEDs have been used as bandwidth-limited photo-detectors: sun photometry [ 15 , 16 ], field radiometry [ 17 , 18 , 19 ], visible light communications [ 20 ], luminescence [ 21 ], and others. Unfortunately, these applications are still very limited and the companies producing LEDs do not provide any information on their devices’ detection properties.…”

Section: Introductionmentioning

confidence: 99%

“…The LED’s source properties are then reported in Section 3 while, in Section 4 , the detection properties are summarized. Moreover, in Section 5 the matching between the source and detection spectra is considered, with a practical example that refers to the realization of our LED radiometer [ 18 , 19 ]. Finally, in Section 6 , we summarize the main findings.…”

Section: Introductionmentioning

confidence: 99%

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LEDs: Sources and Intrinsically Bandwidth-Limited Detectors

Filippo

Taralli

Rajteri

2017

Sensors

Self Cite

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The increasing demand for light emitting diodes (LEDs) is driven by a number of application categories, including display backlighting, communications, signage, and general illumination. Nowadays, they have also become attractive candidates as new photometric standards. In recent years, LEDs have started to be applied as wavelength-selective photo-detectors as well. Nevertheless, manufacturers’ datasheets are limited about LEDs used as sources in terms of degradation with operating time (aging) or shifting of the emission spectrum as a function of the forward current. On the contrary, as far as detection is concerned, information about spectral responsivity of LEDs is missing. We investigated, mainly from a radiometric point of view, more than 50 commercial LEDs of a wide variety of wavelength bands, ranging from ultraviolet (UV) to near infrared (NIR). Originally, the final aim was to find which LEDs could better work together as detector-emitter pairs for the creation of self-calibrating ground-viewing LED radiometers; however, the findings that we are sharing here following, have a general validity that could be exploited in several sensing applications.

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LED-based field radiometer for sensor web in-situ measurements

Cited by 2 publications

References 8 publications

Development and characterization of an LED-based detector for dosimetry in diagnostic radiology

Development and characterization of an LED-based detector for dosimetry in diagnostic radiology

LEDs: Sources and Intrinsically Bandwidth-Limited Detectors

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