alfasense opc

Evaluation of a low-cost optical particle counter (Alphasense OPC …

We evaluated the Alphasense OPC-N2, a promising low-cost miniature optical particle counter, for monitoring am-bient airborne particles at typical urban background sites in the UK. The precision of the OPC-N2 was assessed by co-locating 14 instruments at a site to investigate the variation in measured concentrations. Comparison to two different ref-erence optical particle counters as well as a TEOM …

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Evaluation of the Alphasense Optical Particle Counter (OPC-N2) …

We compared the performance of a low-cost (∼$500), compact optical particle counter (OPC, OPC-N2, Alphasense) to another OPC (, Grimm Technologies) and reference instruments. We measured the detection efficiency of the OPCs by size from to 5 μm for monodispersed, polystyrene latex (PSL) spheres. We then compared number and mass concentrations measured with the OPCs …

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GitHub - dhhagan/py-opc: Python wrapper for the Alphasense OPC …

11/10/2018· Python library for operating the Alphasense OPC-N2 Optical Particle Counter using a Raspberry Pi (or other linux device). Full documentation can be found here. Dependencies. One of the following, depending on whether you use GPIO pins or a SPI-USB adapter: py-spidev - for those using GPIO pins; pyusbiss - for those using a SPI-USB adapter (python3+ only) Additional Dependencies …

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Alphasense OPC-N2 — VAQUUMS project website

The Alphasense OPC-N2 is an optical particle counter. According to the manufacturer, the flow correction of this sensor ensures stable readings, even in high dust environments. The OPC-N2 measures particles from micron to 17 micron diameter at a 1 second interval. The OPC-N2 provides both PM readings and real time particle size histograms.

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Evaluation of the Alphasense optical particle counter (OPC-N2) …

The OPC-N2 (Alphasense Ltd., cost: »$500, Essex, United Kingdom) is a low-cost optical particle counter that has recently become available for environmental monitoring. The OPC-N2 (Alphasense 2015) measures particle number concentration in 16 bins from mm to 17 mm and calculates mass concentration for three particle sizes (PM 1,PM , and PM 10). The OPC-N2 con-tains a laser (25 …

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A Low-cost Portable PM-Measurement System Based on the Alphasense OPC …

Since the Alphasense OPC-N2 used as PM sensor requires a dedicated SPI bus and because an Arduino microcontroller provides only a single SPI bus, one Arduino Uno is dedicated to control the OPC. The OPC data lines use logic-levels whereas the . 3 Arduino Uno uses 5V. Therefore, a level-shifter is necessary. The power supply of the internal electronic of the OPC and its air fan requires 5V. …

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Field Evaluation AlphaSense OPC-N2 Sensor

•AlphaSense OPC-N2 PM data was usually largely underestimated, while AlphaSense PM and PM 10 data were closer to the corresponding FEM values. However, no sensor calibration was performed prior to the beginning of this field testing •Laboratory chamber testing is necessary to fully evaluate the performance of these sensors under known aerosol concentrations and controlled temperature and …

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072-0300 OPC-N2 manual issue 3 final 240415

The Alphasense OPC-N2 uses a different approach: we removed the pump and replaceable particle filter. Instead, the patented OPC-N2 uses an elliptical mirror and dual-element photodetector to create a ‘virtual sensing zone’ in free space at the centre of an open scattering chamber. The OPC-N2 classifies each particle size, at rates up to ~10,000 particle per second, recording the particle size to one of 16 …

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Figure 1 OPC-N2 Schematic Diagram tion ica - Alphasense

( ©ALPHASENSE L TD ) Doc. Ref. OPC-N2/MA Y17 For further information on the performance of this sensor , on other sensors in the range or any other subject, please cont act Alphasense Ltd. For Application Notes visit “ ”. Figure 2 Particle size derivative comparison The OPC correlates well when validated with Grimm and TSI instruments. Figure 3 shows the OPC-N2 particle …

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Alphasense OPC-N2 / OPC-N3

The Alphasense OPC-N2 / OPC-N3 sensors are an optical particle monitor that measures PM , PM and PM 10. Alphasense is certified with ISO 9001:2015. Principle of Operation The Alphasense OPC-N2 / OPC-N3 sensors use laser beams to detect particles from micron to 17 micron in diameter with 16 bins ( to 40 µm with 24 bins for OPC-N3). Count measurements are converted into mass …

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Alphasense OPC-N2 / OPC-N3

Alphasense OPC-N2 / OPC-N3 During this difficult time, South Coast AQMD is committed to protecting air quality and public health. Please visit our COVID-19 page for the operational updates and latest information.

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Alphasense Particle Sensor - OPC-N2

OPC-N2 Alphasense Particle Sensor Description. Alphasense is dedicated to supplying sensors for air quality networks. Increased awareness of the health danger from particulates has raised significantly the importance of monitoring PM. Our Optical Particle Monitor OPC-N2 measures PM1, and PM10, augmenting our range of gas and VOC sensors for indoor and urban air quality …

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Laboratory Evaluation Alphasense OPC-N3 Sensor

Three Alphasense OPC-N3 sensors (units IDs: 0217, 0218 and 0219) were field-tested at the South Coast AQMD Rubidoux fixed ambient monitoring station (08/15/2018 to 10/11/2018) under ambient environmental conditions and have now been evaluated in the South Coast AQMD Chemistry Laboratory

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Arduino Library for Alphasense OPC-N3 - GitHub

22/09/2019· Arduino Library for Alphasense OPC-N3 Getting started. Download the corresponding release; Load the .zip with Sketch → Include Library → Add .ZIP Library; See examples/ API OPCN3 OPCN3(uint8_t pinSelect, uint32_t speedSelect)The constructor of the OPCN3 class. uint8_t pinSelect: The number of the ss pin.. uint32_t speedSelect: The speed in Hz (default 500000). begin()

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Evaluation of Nine Low-cost-sensor-based Particulate Matter …

01/02/2020· The Alphasense OPC-N3 particulate monitor (Alphasense Ltd., Great Notley, UK) has been evaluated focusing on its ability to accurately report the mass concentration of PM 1, PM , and PM 10 (Sousan et al., 2016a; Crilley et al., 2018). The PurpleAir PA-II-SD Air Quality Sensor (PurpleAir, UT, USA) has demonstrated good linearity against reference instruments for both laboratory …

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GitHub - JHabeck/Alphasense-OPC-N2

-- OPC_on() - Turn on the OPC laser and fan. Returns 1 if successful. -- OPC_off() - Turn off the OPC laser and fan. Returns 1 if successful. -- OPC_getData() - read count/s per bin, sample flow rate (sfr), and sampling period (sp) from histogram, then reset histogram All communication is via SPI logic lines. NOTE THAT THE SPI LOGIC LINES ...

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GitHub - dhhagan/opcn2: C++ Library for the Alphasense OPC …

17/07/2018· The Alphasense OPC-N2 is an optical particle counter for use in indoor and outdoor particle monitoring. This library makes it easy to operate the OPC-N2 from a Particle Photon, Particle Electron, or Arduino (not yet tested). Example Usage. Three examples are located in the examples folder. \run-the-opc: shows you the basics of how to use the library with a Particle photon/electron. \tests: …

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