

FOLLOWUS
1.College of Information Science and Engineering, Ocean University of China, Qingdao 266100, China
2.R&D Center for Marine Instruments and Apparatuses, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
Jinjia GUO, opticsc@ouc.edu.cn
纸质出版:2022-03
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A low-cost in-situ CO2 sensor based on a membrane and NDIR for long-term measurement in seawater[J]. 海洋湖沼学报(英文), 2022,40(3):986-998.
Meng LI, Baolu DU, Jinjia GUO, et al. A low-cost in-situ CO2 sensor based on a membrane and NDIR for long-term measurement in seawater[J]. Journal of Oceanology and Limnology, 2022, 40(3): 986-998.
A low-cost in-situ CO2 sensor based on a membrane and NDIR for long-term measurement in seawater[J]. 海洋湖沼学报(英文), 2022,40(3):986-998. DOI: 10.1007/s00343-021-1133-7.
Meng LI, Baolu DU, Jinjia GUO, et al. A low-cost in-situ CO2 sensor based on a membrane and NDIR for long-term measurement in seawater[J]. Journal of Oceanology and Limnology, 2022, 40(3): 986-998. DOI: 10.1007/s00343-021-1133-7.
The multi-point simultaneous long-term measurement of CO
2
concentration in seawater can provide more-valuable data for further understanding of the spatial and temporal distribution of CO
2
. Thus
the requirement for a low-cost sensor with high precision
low power consumption
and a small size is becoming urgent. In this work
an in-situ sensor for CO
2
detection in seawater
based on a permeable membrane and non-dispersive infrared (NDIR) technology
is developed. The sensor has a small size (Ф 66 mm×124 mm)
light weight (0.7 kg in air)
low power consumption (
<
0.9 W)
low cost (
<
US$1 000)
and high-pressure tolerance (
<
200 m). After laboratory performance tests
the sensor was found to have a measurement range of (0–2 000)×10
-6
and the gas linear correlation
R
2
is 0.99
with a precision of about 0.98% at a sampling rate of 1 s. A comparison measurement was carried out with a commercial sensor in a pool for 7 days
and the results showed a consistent trend. Further
the newly developed sensor was deployed in Qingdao nearshore water for 35 days. The results proved that the sensor could measure the dynamic changes of CO
2
concentration in seawater continuously
and had the potential to carry out long-term observations on an oceanic platform. It is hoped that the sensor could be applied to field ocean observations in near future.
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