scholarly journals Large area silicon photomultipliers allow extreme depth penetration in time-domain diffuse optics

2016 ◽  
Author(s):  
E. Martinenghi ◽  
A. Dalla Mora ◽  
L. Di Sieno ◽  
S. Konugolu Venkata Sekar ◽  
D. Contini ◽  
...  
Keyword(s):  
Time Domain ◽  
Large Area ◽  
Silicon Photomultipliers ◽  
Diffuse Optics

scholarly journals Single-Photon Detection Module Based on Large-Area Silicon Photomultipliers for Time-Domain Diffuse Optics

Instruments ◽  
2021 ◽  
Vol 5 (2) ◽  
pp. 18
Author(s):  
Fabio Acerbi ◽  
Anurag Behera ◽  
Alberto Dalla Mora ◽  
Laura Di Sieno ◽  
Alberto Gola
Keyword(s):  
Time Resolution ◽  
Time Domain ◽  
Single Photon ◽  
Building Blocks ◽  
The Body ◽  
Single Photon Detection ◽  
Silicon Photomultipliers ◽  
Photon Detection ◽  
Instrument Response Function ◽  
Diffuse Optics

Silicon photomultipliers (SiPM) are pixelated single-photon detectors combining high sensitivity, good time resolution and high dynamic range. They are emerging in many fields, such as time-domain diffuse optics (TD-DO). This is a promising technique in neurology, oncology, and quality assessment of food, wood, and pharmaceuticals. SiPMs can have very large areas and can significantly increase the sensitivity of TD-DO in tissue investigation. However, such improvement is currently limited by the high detector noise and the worsening of SiPM single-photon time resolution due to the large parasitic capacitances. To overcome such limitation, in this paper, we present two single-photon detection modules, based on 6 × 6 mm2 and 10 × 10 mm2 SiPMs, housed in vacuum-sealed TO packages, cooled to −15 °C and −36 °C, respectively. They integrate front-end amplifiers and temperature controllers, being very useful instruments for TD-DO and other biological and physical applications. The signal extraction from the SiPM was improved. The noise is reduced by more than two orders of magnitude compared to the room temperature level. The full suitability of the proposed detectors for TD-DO measurements is outside the scope of this work, but preliminary tests were performed analyzing the shape and the stability of the Instrument Response Function. The proposed modules are thus fundamental building blocks to push the TD-DO towards deeper investigations inside the body.

scholarly journals Research on Hydroelastic Response of an FMRC Hexagon Enclosed Platform

Symmetry ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1110
Author(s):  
Wei-Qin Liu ◽  
Luo-Nan Xiong ◽  
Guo-Wei Zhang ◽  
Meng Yang ◽  
Wei-Guo Wu ◽  
...  
Keyword(s):  
Time Domain ◽  
Numerical Models ◽  
Structural Response ◽  
Deep Ocean ◽  
Surface Model ◽  
Large Area ◽  
Floating Structure ◽  
Small Depth ◽  
Response Amplitude Operators ◽  
Hydroelastic Response

The numerical hydroelastic method is used to study the structural response of a hexagon enclosed platform (HEP) of flexible module rigid connector (FMRC) structure that can provide life accommodation, ship berthing and marine supply for ships sailing in the deep ocean. Six trapezoidal floating structures constitute the HEP structure so that it is a symmetrical very large floating structure (VLFS). The HEP has the characteristics of large area and small depth, so its hydroelastic response is significant. Therefore, this paper studies the structural responses of a hexagon enclosed platform of FMRC structure in waves by means of a 3D potential-flow hydroelastic method based on modal superposition. Numerical models, including the hydrodynamic model, wet surface model and finite element method (FEM) model, are established, a rigid connection is simulated by many-point-contraction (MPC) and the number of wave cases is determined. The load and structural response of HEP are obtained and analyzed in all wave cases, and frequency-domain hydroelastic calculation and time-domain hydroelastic calculation are carried out. After obtaining a number of response amplitude operators (RAOs) for stress and time-domain stress histories, the mechanism of the HEP structure is compared and analyzed. This study is used to guide engineering design for enclosed-type ocean platforms.

scholarly journals Towards next-generation time-domain diffuse optics for extreme depth penetration and sensitivity

2015 ◽  
Vol 6 (5) ◽  
pp. 1749 ◽  
Author(s):  
Alberto Dalla Mora ◽  
Davide Contini ◽  
Simon Arridge ◽  
Fabrizio Martelli ◽  
Alberto Tosi ◽  
...  
Keyword(s):  
Time Domain ◽  
Generation Time ◽  
Next Generation ◽  
Diffuse Optics

scholarly journals Large-Area, Fast-Gated Digital SiPM With Integrated TDC for Portable and Wearable Time-Domain NIRS

2020 ◽  
Vol 55 (11) ◽  
pp. 3097-3111
Author(s):  
Enrico Conca ◽  
Vincenzo Sesta ◽  
Mauro Buttafava ◽  
Federica Villa ◽  
Laura Di Sieno ◽  
...  
Keyword(s):  
Time Domain ◽  
Large Area

scholarly journals A search for variable white dwarfs in large-area time-domain surveys: a pilot study in SDSS Stripe 82

2015 ◽  
Vol 455 (3) ◽  
pp. 2295-2307 ◽  
Author(s):  
Nicola Pietro Gentile Fusillo ◽  
J. J. Hermes ◽  
Boris T. Gänsicke
Keyword(s):  
Pilot Study ◽  
Time Domain ◽  
White Dwarfs ◽  
Large Area

scholarly journals Characterisation of SiPM Photon Emission in the Dark

Sensors ◽  
2021 ◽  
Vol 21 (17) ◽  
pp. 5947
Author(s):  
Joseph Biagio McLaughlin ◽  
Giacomo Gallina ◽  
Fabrice Retière ◽  
Austin De St. De St. Croix ◽  
Pietro Giampa ◽  
...  
Keyword(s):  
Interference Pattern ◽  
Wavelength Range ◽  
Photon Emission ◽  
Emission Spectra ◽  
Double Beta Decay ◽  
Photon Yield ◽  
Large Area ◽  
Silicon Photomultipliers ◽  
Photo Sensor ◽  
New Apparatus

In this paper, we report on the photon emission of Silicon Photomultipliers (SiPMs) from avalanche pulses generated in dark conditions, with the main objective of better understanding the associated systematics for next-generation, large area, SiPM-based physics experiments. A new apparatus for spectral and imaging analysis was developed at TRIUMF and used to measure the light emitted by the two SiPMs considered as photo-sensor candidates for the nEXO neutrinoless double-beta decay experiment: one Fondazione Bruno Kessler (FBK) VUV-HD Low Field (LF) Low After Pulse (Low AP) (VUV-HD3) SiPM and one Hamamatsu Photonics K.K. (HPK) VUV4 Multi-Pixel Photon Counter (MPPC). Spectral measurements of their light emissions were taken with varying over-voltage in the wavelength range of 450–1020 nm. For the FBK VUV-HD3, at an over-voltage of 12.1±1.0 V, we measured a secondary photon yield (number of photons (γ) emitted per charge carrier (e−)) of (4.04±0.02)×10−6γ/e−. The emission spectrum of the FBK VUV-HD3 contains an interference pattern consistent with thin-film interference. Additionally, emission microscopy images (EMMIs) of the FBK VUV-HD3 show a small number of highly localized regions with increased light intensity (hotspots) randomly distributed over the SiPM surface area. For the HPK VUV4 MPPC, at an over-voltage of 10.7±1.0 V, we measured a secondary photon yield of (8.71±0.04)×10−6γ/e−. In contrast to the FBK VUV-HD3, the emission spectra of the HPK VUV4 did not show an interference pattern—likely due to a thinner surface coating. The EMMIs of the HPK VUV4 also revealed a larger number of hotspots compared to the FBK VUV-HD3, especially in one of the corners of the device. The photon yield reported in this paper may be limited if compared with the one reported in previous studies due to the measurement wavelength range, which is only up to 1020 nm.

Sign in / Sign up

Export Citation Format

Share Document