POPS - Handix Scientific Inc.

POPS

Portable Optical Particle Spectrometer

Purpose

The Portable Optical Particle Spectrometer (POPS) is a light-weight, high-performance, and relatively low-cost particle counter. It is the ideal tool for measuring aerosol size distributions using unmanned platforms and ground-based sensor networks.

Applications:

Aerosol profiling on unmanned platforms such as radiosonde balloons, tethered balloons, and unmanned aerial vehicles (UAVs)
Ambient environmental monitoring networks
Work place monitoring
Indoor air quality research
Particle measurements in remote environments

The POPS core system shown without optional enclosure or power supply.

Features

Diameter range: single particle in the diameter range 0.13 - 3 μm in user-specified number of sizing channels
Diameter resolution: ~5% of diameter
Adjustable flow rate for different concentration regimes
Optional ground, airborne or modular enclosure packages to fit your measurement application
Built-in data acquisition and logging capability

Specifications

Operation

Sample aerosol is drawn into the measurement region and surrounded by filtered sheath air. The sample flow is monitored using a laminar flow element and feedback controlled. Particles are illuminated by a 405 nm diode laser. Light scattered by the particle is focused onto a photomultiplier tube by a spherical mirror (38° - 142° collection angle). The intensity of the scattered light pulse is proporitional to the diameter of the sampled particle. The POPS is calibrated using NIST traceable polystyrene latex spheres (PSL).

Diagram of the POPS Measurement Chamber

Yu, P., et al., Efficient transport of tropospheric aerosol into the stratosphere via the Asian summer monsoon anticyclone, PNAS, 6972-6977, 2017.

Gao, R.S., et al., A light-weight, high-sensitivity particle spectrometer for PM2.5 aerosol measurements, Aerosol Science and Technology 50, 88-99, 2016.

Reference:

Particle Size Range	Min. Detectable (D50) 130 nm Max. Detectable 3.0 μm
Particle Concentration Range	Minimum limited by counting statistics Max. with <10% coincidence error (for 0.1 LPM sample flow rate) 1250 #/cm3
Particle Concentration Accuracy	+/- 10% < 1000 #/cm3 (for 0.1 LPM sample flow rate)
Flow	Min. Sample Flow Rate 0.05 LPM Max. Sample Flow Rate 0.35 LPM
Environmental Operating Conditions	Min. Temperature. -40 C Max. Temperature. +35 C Ambient Humidity 0-95% non-condensing
Data Logging and Storage	On-board 32 GB micro-SD.
Laser	Wavelength 405nm Power ~70mW
Logging Interval	1 Hz
Power Requirements	DC power (AC adapter or battery) +12VDC Average power consumption 5W
Communications	Ethernet Interface: 8-wire, RJ-45, 10/100 BASE-T, TCP/IP Serial: RS-232 USB (diagnostic mode): USB
Physical Dimensions	Core system: 175 x 162 x 88 mm
Weight	Core system: 600 g
Detector Geometry	Collection angle: 38°-142°

Specifications subject to change without notice.

Particle Size Range

Min. Detectable (D50) 130 nm Max. Detectable 3.0 μm

Particle Concentration Range

Minimum limited by counting statistics

Max. with <10% coincidence error (for 0.1 LPM sample flow rate) 1250 #/cm3

Particle Concentration Accuracy

+/- 10% < 1000 #/cm3 (for 0.1 LPM sample flow rate)

Flow

Min. Sample Flow Rate 0.05 LPM Max. Sample Flow Rate 0.35 LPM

Environmental Operating Conditions

Min. Temperature. -40 C

Max. Temperature. +35 C

Ambient Humidity 0-95% non-condensing

Data Logging and Storage

On-board 32 GB micro-SD.

Laser

Wavelength 405nm

Power ~70mW

Logging Interval

1 Hz

Power Requirements

DC power (AC adapter or battery) +12VDC

Average power consumption 5W

Communications

Ethernet Interface: 8-wire, RJ-45, 10/100 BASE-T, TCP/IP Serial: RS-232 USB (diagnostic mode): USB

Physical Dimensions

Core system: 175 x 162 x 88 mm

Weight

Core system: 600 g

Detector Geometry

Collection angle: 38°-142°

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Min. Detectable (D50) 130 nm
Max. Detectable 3.0 μm

+/- 10% < 1000 #/cm3
(for 0.1 LPM sample flow rate)

Min. Sample Flow Rate 0.05 LPM
Max. Sample Flow Rate 0.35 LPM

Ethernet Interface: 8-wire, RJ-45, 10/100 BASE-T, TCP/IP
Serial: RS-232
USB (diagnostic mode): USB