1. Novel environmental sensors: improving measurements in the arctic
Fernando Sparasci
LNE-Cnam, France

2. Temperature metrology in France
Laboratoire National de Métrologie et d'Essais
National Metrology Institute
Conservatoire National des Arts et Métiers
Higher education institution
LNE-Cnam – Joint laboratory between LNE and Cnam
Thermal Metrology department at LNE-Cnam
National temperature standards in France
Boltzmann constant determination and new kelvin definition
EU-funded research on metrology for environment (MeteoMet)
Laurent Pitre
Lara Risegari
Nicola Chiodo
Fernando Sparasci
Bruno Buée
Andrea Cappella
Carolina Cappella
Cécile Guianvarc’h

3. Metrology for environment: current research
Facility for thermometer calibrations for air temperature measurements
Novel Microwave hygrometers
from 1 to 105 ppmv of water vapour in air
i.e. the full troposphere
65 cm3
from -120 °C to 30 °C
from ground to lower stratosphere
Calibrated reference hygrometer vs
uncalibrated microwave hygrometer
Successfully used by the
Laboratory of Dynamic Meteorology LMD
on balloon-borne temperature measurements
to develop a new frost-point hygrometer

4. Metrology for environment: current research
Metrological characterization of absolute salinometers
Metrological characterization of oceanographic thermometers
Thermodynamic temperature characterization
of SBE 35 oceanographic thermometers
between 4 °C and 40 °C
down to 2500 m depth
NOSS
Refractive-index absolute salinometer
nke Instrumentation
Improve the knowledge of oceanographic thermometer performances
We are building a calibration facility:
to characterize this innovative sensor
in view of large-scale deployment in oceans

5. Metrology for the arctic: possible developments
Calibration-free hygrometers:
thermophysical properties of air + water vapour
same microwave technology
cost effective
extremely practical in arctic
Further development of NOSS absolute salinometer
consistently improve “refractive index – density – salinity” relations
assess salinity anomalies in the arctic oceans

6. Metrology for the arctic: possible developments
Compact calibration system for air-thermometers
scaled version of LNE-Cnam system
reduced volume and power absorption
suitable for arctic calibration laboratory
from -120 °C to 30 °C
from ground to lower stratosphere
Source: Janis Research
Company