Low-Cost Control and Measurement Circuit for the Implementation of Single Element Heat Dissipation Soil Water Matric Potential Sensor Based on a SnSe2 Thermosensitive Resistor
A low-cost signal processing circuit developed to measure and drive a heat dissipation soil matric potential sensor based on a single thermosensitive resistor is demonstrated. The SnSe2 has a high thermal coefficient, from −2.4Ω/°C in the 20 to 25 °C to −1.07Ω/°C in the 20 to 25 °C. The SnSe2 thermo...
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Published in | Sensors (Basel, Switzerland) Vol. 21; no. 4; p. 1490 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
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Abstract | A low-cost signal processing circuit developed to measure and drive a heat dissipation soil matric potential sensor based on a single thermosensitive resistor is demonstrated. The SnSe2 has a high thermal coefficient, from −2.4Ω/°C in the 20 to 25 °C to −1.07Ω/°C in the 20 to 25 °C. The SnSe2 thermosensitive resistor is encapsulated with a porous gypsum block and is used as both the heating and temperature sensing element. To control the power dissipated on the thermosensitive resistor and keep it constant during the heat pulse, a mixed analogue/digital circuit is used. The developed control circuit is able to maintain the dissipated power at 327.98±0.3% mW when the resistor changes from 94.96Ω to 86.23Ω. When the gravimetric water content of the porous block changes from dry to saturated (θw=36.7%), we measured a variation of 4.77Ω in the thermosensitive resistor, which results in an end-point sensitivity of 130 mΩ/%. The developed system can easily meet the standard requirement of measuring the gravimetric soil water content with a resolution of approximately Δθw=1%, since the resistance is measured with a resolution of approximately μ31μΩ, three orders of magnitude smaller than the sensitivity. |
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AbstractList | A low-cost signal processing circuit developed to measure and drive a heat dissipation soil matric potential sensor based on a single thermosensitive resistor is demonstrated. The
SnSe
2
has a high thermal coefficient, from
−
2.4
Ω
/
°
C in the 20 to 25
°
C to
−
1.07
Ω
/
°
C in the 20 to 25
°
C. The
SnSe
2
thermosensitive resistor is encapsulated with a porous gypsum block and is used as both the heating and temperature sensing element. To control the power dissipated on the thermosensitive resistor and keep it constant during the heat pulse, a mixed analogue/digital circuit is used. The developed control circuit is able to maintain the dissipated power at
327.98
±
0.3
%
mW when the resistor changes from
94.96
Ω
to
86.23
Ω
. When the gravimetric water content of the porous block changes from dry to saturated (
θ
w
=
36.7
%
), we measured a variation of
4.77
Ω
in the thermosensitive resistor, which results in an end-point sensitivity of 130 m
Ω
/%. The developed system can easily meet the standard requirement of measuring the gravimetric soil water content with a resolution of approximately
Δ
θ
w
=
1
%
, since the resistance is measured with a resolution of approximately
31
μ
Ω
, three orders of magnitude smaller than the sensitivity. A low-cost signal processing circuit developed to measure and drive a heat dissipation soil matric potential sensor based on a single thermosensitive resistor is demonstrated. The SnSe2 has a high thermal coefficient, from −2.4 Ω/° C in the 20 to 25 ° C to −1.07 Ω/° C in the 20 to 25 ° C. The SnSe2 thermosensitive resistor is encapsulated with a porous gypsum block and is used as both the heating and temperature sensing element. To control the power dissipated on the thermosensitive resistor and keep it constant during the heat pulse, a mixed analogue/digital circuit is used. The developed control circuit is able to maintain the dissipated power at 327.98±0.3% mW when the resistor changes from 94.96 Ω to 86.23 Ω . When the gravimetric water content of the porous block changes from dry to saturated ( θw=36.7% ), we measured a variation of 4.77 Ω in the thermosensitive resistor, which results in an end-point sensitivity of 130 m Ω /%. The developed system can easily meet the standard requirement of measuring the gravimetric soil water content with a resolution of approximately Δθw=1% , since the resistance is measured with a resolution of approximately μ 31 μ Ω , three orders of magnitude smaller than the sensitivity. A low-cost signal processing circuit developed to measure and drive a heat dissipation soil matric potential sensor based on a single thermosensitive resistor is demonstrated. The SnSe2 has a high thermal coefficient, from −2.4Ω/°C in the 20 to 25 °C to −1.07Ω/°C in the 20 to 25 °C. The SnSe2 thermosensitive resistor is encapsulated with a porous gypsum block and is used as both the heating and temperature sensing element. To control the power dissipated on the thermosensitive resistor and keep it constant during the heat pulse, a mixed analogue/digital circuit is used. The developed control circuit is able to maintain the dissipated power at 327.98±0.3% mW when the resistor changes from 94.96Ω to 86.23Ω. When the gravimetric water content of the porous block changes from dry to saturated (θw=36.7%), we measured a variation of 4.77Ω in the thermosensitive resistor, which results in an end-point sensitivity of 130 mΩ/%. The developed system can easily meet the standard requirement of measuring the gravimetric soil water content with a resolution of approximately Δθw=1%, since the resistance is measured with a resolution of approximately μ31μΩ, three orders of magnitude smaller than the sensitivity. |
Author | Dias, José A. Siqueira Dos Santos, Adelson Zhang, Yu Flosi, Fábio S. Duarte, Luis Caparroz Carvalhaes-Dias, Pedro Cabot, Andreu Morais, Flávio |
AuthorAffiliation | 1 Faculty of Science and Engineering, Universidade Estadual Paulista (UNESP), Tupã, SP 17602-496, Brazil; flavio.morais@unesp.br 4 Catalan Institution for Research and Advanced Studies—ICREA, Pg. Lluís Companys 23, 08010 Barcelona, Spain 2 Department of Electrical Engineering, Universidade Tecnológica Federal do Paraná (UTFPR), Cornélio Procópio, PR 86300-000, Brazil; pcdias@utfpr.edu.br (P.C.-D.); lfduarte@utfpr.edu.br (L.C.D.) 3 Catalonia Institute for Energy Research (IREC), Jardins de les Dones de Negre 1, 08930 Barcelona, Spain; peterzhang@irec.cat (Y.Z.); acabot@irec.cat (A.C.) 5 Department of Semiconductors, Instrumentation and Photonics, School of Electrical and Computer Engineering, University of Campinas, Campinas, SP 13083-820, Brazil; fabioflosi@interair.com.br (F.S.F.); adelson@dsif.fee.unicamp.br (A.D.S.) |
AuthorAffiliation_xml | – name: 3 Catalonia Institute for Energy Research (IREC), Jardins de les Dones de Negre 1, 08930 Barcelona, Spain; peterzhang@irec.cat (Y.Z.); acabot@irec.cat (A.C.) – name: 5 Department of Semiconductors, Instrumentation and Photonics, School of Electrical and Computer Engineering, University of Campinas, Campinas, SP 13083-820, Brazil; fabioflosi@interair.com.br (F.S.F.); adelson@dsif.fee.unicamp.br (A.D.S.) – name: 4 Catalan Institution for Research and Advanced Studies—ICREA, Pg. Lluís Companys 23, 08010 Barcelona, Spain – name: 1 Faculty of Science and Engineering, Universidade Estadual Paulista (UNESP), Tupã, SP 17602-496, Brazil; flavio.morais@unesp.br – name: 2 Department of Electrical Engineering, Universidade Tecnológica Federal do Paraná (UTFPR), Cornélio Procópio, PR 86300-000, Brazil; pcdias@utfpr.edu.br (P.C.-D.); lfduarte@utfpr.edu.br (L.C.D.) |
Author_xml | – sequence: 1 givenname: Flávio orcidid: 0000-0002-7638-1984 surname: Morais fullname: Morais, Flávio – sequence: 2 givenname: Pedro orcidid: 0000-0002-0213-4382 surname: Carvalhaes-Dias fullname: Carvalhaes-Dias, Pedro – sequence: 3 givenname: Yu orcidid: 0000-0002-0332-0013 surname: Zhang fullname: Zhang, Yu – sequence: 4 givenname: Andreu orcidid: 0000-0002-7533-3251 surname: Cabot fullname: Cabot, Andreu – sequence: 5 givenname: Fábio S. orcidid: 0000-0002-5769-9882 surname: Flosi fullname: Flosi, Fábio S. – sequence: 6 givenname: Luis Caparroz orcidid: 0000-0001-7794-6003 surname: Duarte fullname: Duarte, Luis Caparroz – sequence: 7 givenname: Adelson orcidid: 0000-0001-8396-1760 surname: Dos Santos fullname: Dos Santos, Adelson – sequence: 8 givenname: José A. Siqueira orcidid: 0000-0001-5660-7301 surname: Dias fullname: Dias, José A. Siqueira |
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SubjectTerms | heat dissipation matric water potential sensor heat dissipation soil matric potential sensor power control circuits signal conditioning circuit single-element soil matric water potential sensor |
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Title | Low-Cost Control and Measurement Circuit for the Implementation of Single Element Heat Dissipation Soil Water Matric Potential Sensor Based on a SnSe2 Thermosensitive Resistor |
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