Outline
CPS （Cloud Particle Sensor）, combined with GPS
radiosonde, provides in-situ cloud measurements
including vertical distribution of cloud particles(number density, size, and the phase (water cloud-iceclouds)/shape) in addition to the fundamental
meteorological elements (Temperature, Humidity,
Height and Wind direction/velocity).
CPS collects ambient air samples through its duct
during radiosonde’s ascent and measures floating
particles with light scattering method by using one
linearly polarized light source and two photodiodedetectors. One detector directly measures thescattered light from the particle, and the other detects
the polarization components of the scattered light.
CPS sonde is compatible with MEISEI standard GPS
sonde ground system (RD-08AC) and software(MGPS-R). Output data include the number of counts
per second, scattered light intensity and degree ofpolarization, which provide us with number density,
particle size and the phase (water cloud-ice clouds)/
shape of cloud particles.

Features:
Measurement of accurate vertical distribution of cloud and ash, etc. simultaneous with the fundamental
meteorological elements● Easy to handle/launch without special preparation because of its compact size and lightweight (approximately320g).
● Compatible with GPS sonde ground system RD-08AC and sounding software MGPS-R.
●Example in Moriya, Japan at 18th March 2013 18LT

No. MSPA4-037

Specifications
SensorCloud particle sensor CPS *a SHINYEI Technology Co., LTD.

Number density

MeasuringRange< 1 / cm3 *b
The presence/absence of particle
can be detected even > 1 / cm3Particle size

15 μm (>2 μm can be detected) *c

Output signal voltage

0—8V

Sampling rate

Operation
Environment
Power Source

Temperature -70℃～+40℃
Humidity

0%～100%Pressure

1050 hPa～5 hPa

Voltage

9 VDC (CPS), 3 VDC (RS-11G)

Model

Lithium battery (CR123)×3 (CPS)
Lithium battery (CR123)×1 (RS-11G)

Dimensions

1 sec

Size & Weight188( W) x 113 (D) x 123 (H) mm
Except protuberance, with RS-11G

Weight

320 g (with RS-11G)*a) When using in day time observation, inlet tube is required to prevent light penetration from the influence of solar radiation.
*b) Number density is calculated on the assumption that particle’s fall velocity in the CPS is equal to ascent rate of sonde itself.
*c) Please contact us for more details.

Block Diagram
P OUTPUT
Scattered light intensity

S OUTPUTGPS radiosonde

CPU

Scattered light intensity(Polarization component)

Digital signal(25 byte/s)

RS-11G
400 MHz Band
Radio wave

C OUTPUT
Width of the detection pulse
CPS Sensor

I/F borad

RD-08AC
Ground Receiver

Outline View

Cautions● For safe and correct usage, please read the "Operation Manual" prior to the use of the products.
● The specifications and appearances might be changed without prior notice, which please understand.
● The specifications shown in the catalog are of our standard products. We are pleased to customize it to meet customer's requirements. For the details, pleasecontact us.
● Please understand in advance that our company cannot assume the responsibility of any claims made by the third party about any monetary damages or any

loss of profits arising out from the use of our products.
● The color of the product photography on catalog might be different from that of actual product because of printing.

1-1, Toyosu 3-chome,Koto-ku, Tokyo 135-8115, Japan
Tel: +81-3-6204-8254 Fax: +81-3-6204-8888
http://www.meisei.jp/sonde/
The specifications this catalog are current as of April 2015.

No. MSPA4-037