The perfusion sensors’ illumination was generated by a fibre-coupled high-power LED (M530F1, Thorlabs, USA), with central wavelength 530 nm, yielding a full width half maximum of 33 nm and an optical power output of approximately 5.1 mW. The LED was driven with a maximum output of 1000 mA and a current ripple of 8 mA (LEDD18 driver, Thorlabs). The collection fibre was connected to a photodetector with an integral trans-impedance amplifier (PDA36A-EC, Thorlabs), having a switchable gain set to 60 dB. All connectors are SubMiniature Version A (SMA). The analogue-to-digital converter (ADC) channel of a data acquisition card (National Instruments, USB-6361, USA) was used to acquire the output of the photodetector with a sampling frequency of 5 kHz and 16-bit resolution, operating with a 5 V power supply, and 5 Hz anti-aliasing filter.
Pda36a ec
Manufactured by Thorlabs
The PDA36A-EC is a compact and high-performance photodetector module designed for a wide range of applications. It features a large active area silicon photodiode, a low-noise transimpedance amplifier, and a user-selectable gain. The module provides a linear voltage output that is proportional to the incident optical power.
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3 protocols using pda36a ec
1
Opto-electronic Instrumentation for FBG-based Pressure Sensing
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Figure 3(a) shows a block diagram of the opto-electronic instrumentation developed. The FBG contact pressure sensor was connected to an OEM fibre optic interrogator (Smartscan, Smartfibres, UK). The scanning frequency of the interrogator was 2.5 kHz per channel, over the wavelength range 1528-1568 nm, with a resolution of 16 pm and a repeatability of <1 pm. The interrogator was connected to a laptop to store the pressure data via an ethernet cable.
The perfusion sensors’ illumination was generated by a fibre-coupled high-power LED (M530F1, Thorlabs, USA), with central wavelength 530 nm, yielding a full width half maximum of 33 nm and an optical power output of approximately 5.1 mW. The LED was driven with a maximum output of 1000 mA and a current ripple of 8 mA (LEDD18 driver, Thorlabs). The collection fibre was connected to a photodetector with an integral trans-impedance amplifier (PDA36A-EC, Thorlabs), having a switchable gain set to 60 dB. All connectors are SubMiniature Version A (SMA). The analogue-to-digital converter (ADC) channel of a data acquisition card (National Instruments, USB-6361, USA) was used to acquire the output of the photodetector with a sampling frequency of 5 kHz and 16-bit resolution, operating with a 5 V power supply, and 5 Hz anti-aliasing filter.
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The perfusion sensors’ illumination was generated by a fibre-coupled high-power LED (M530F1, Thorlabs, USA), with central wavelength 530 nm, yielding a full width half maximum of 33 nm and an optical power output of approximately 5.1 mW. The LED was driven with a maximum output of 1000 mA and a current ripple of 8 mA (LEDD18 driver, Thorlabs). The collection fibre was connected to a photodetector with an integral trans-impedance amplifier (PDA36A-EC, Thorlabs), having a switchable gain set to 60 dB. All connectors are SubMiniature Version A (SMA). The analogue-to-digital converter (ADC) channel of a data acquisition card (National Instruments, USB-6361, USA) was used to acquire the output of the photodetector with a sampling frequency of 5 kHz and 16-bit resolution, operating with a 5 V power supply, and 5 Hz anti-aliasing filter.
2
Projecting Biological Samples Using DLP Technology
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The DLP used in the experiments is a DLP LightCrafter 4500 from Texas Instruments. It contains a DMD and three coloured light sources (red, green and blue). A built-in optical system is used to project the patterns onto the scene. The photodetector used is PDA36A-EC from Thorlabs, and the electrical signal is digitalized with NI USB-6001 DAQ. All the experimental results were acquired with a Lenovo ThinkPad E531 laptop with 12GB of RAM and an Intel Core i7 2.20 GHz processor. The biological images used in the simulations correspond to different samples from two slide sets from Carolina (#292148A and #293708).
3
Characterization of Fabricated LED Devices
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The J–V–L characteristics of the fabricated
LEDs were measured under ambient conditions using a Keysight 2902b
source measurement unit and a calibrated photodiode (FDS1010-CAL,
Thorlabs). The size of the photodiode (10 × 10 mm2) is much larger than that of the active pixel size (4 × 4 mm2) of the LEDs. The EQEs of the fabricated LEDs were calculated
from the known EL spectra of the LEDs and photodiode sensitivity,134 (link) while the radiance was calculated assuming
a Lambertian emission profile. EL spectra were recorded using a CCS200
CCD spectrometer (Thorlabs) and a PR-655 (Photoresearch) spectroradiometer.
LED transient optoelectronic properties were measured with a Keysight
2902b source measurement unit and amplified photodiode (PDA36A-EC,
Thorlabs) with 20 μs resolution.
LEDs were measured under ambient conditions using a Keysight 2902b
source measurement unit and a calibrated photodiode (FDS1010-CAL,
Thorlabs). The size of the photodiode (10 × 10 mm2) is much larger than that of the active pixel size (4 × 4 mm2) of the LEDs. The EQEs of the fabricated LEDs were calculated
from the known EL spectra of the LEDs and photodiode sensitivity,134 (link) while the radiance was calculated assuming
a Lambertian emission profile. EL spectra were recorded using a CCS200
CCD spectrometer (Thorlabs) and a PR-655 (Photoresearch) spectroradiometer.
LED transient optoelectronic properties were measured with a Keysight
2902b source measurement unit and amplified photodiode (PDA36A-EC,
Thorlabs) with 20 μs resolution.
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