Abrégé

According to one embodiment of the present invention, a method for measuring the degradation of an electrochemical gas sensor comprises: a first step of comparing (N-1)th voltage measured at an (N-1)th time and N voltage measured at an Nth time; a second step of resetting the numeral stored in a counter to 0 if, as a result of the comparison, the absolute value of the Nth voltage is greater than or equal to the absolute value of the (N-1)th voltage, and increasing the numeral stored in the counter by 1 if, as a result of the comparison, the absolute value of the Nth voltage is smaller than the absolute value of the (N-1)th voltage; and a third step of comparing the numeral stored in the counter with a selected number set on the counter after increasing the numeral stored in the counter by 1 to determine whether or not the electrochemical gas sensor is degraded.

Classes IPC  ?

• G01N 27/407 - Cellules et sondes avec des électrolytes solides pour la recherche ou l'analyse de gaz
• G01N 27/26 - Recherche ou analyse des matériaux par l'emploi de moyens électriques, électrochimiques ou magnétiques en utilisant l'électrolyse ou l'électrophorèse

Abrégé

The present invention relates to a carbon dioxide measuring device. More specifically, the present invention relates to a carbon dioxide measuring device in which one side of a heating means is formed with a pattern for transmitting a reference electrode signal and in which the outside of the portion where the heating means and a carbon dioxide sensor make contact is connected to an electromotive force lead wire for measuring the concentration of carbon dioxide. This arrangement avoids the occurrence of cracking. and prevents sealant from spreading to the reference electrode and from causing any effect on the electromotive force, thereby increasing durability, and accuracy and reliability in measurement of carbon dioxide concentrations. The carbon dioxide measuring device (1000) of the present invention comprises: a carbon dioxide sensor (100) comprising a solid electrolyte (110), and a reference electrode (120) and a sensing electrode (130) formed on one side or on both sides of the solid electrolyte (110); a heating means (200) comprising a ceramic base plate (210) having a heat-emitting part (220) on one side thereof; and an electromotive force lead wire (300) extending to the reference electrode (120) and the sensing electrode (130). The carbon dioxide measuring device of the present invention is advantageous in that, because it employs a heating means formed with a pattern for transmitting a reference electrode signal, the carbon dioxide sensor and the heating means can be joined more effectively by forming the lead wire on the outside of the location where the carbon dioxide sensor and the heating means make contact, and the reliability of carbon dioxide concentration measurement can be further improved by forming a spreading-preventing layer which can prevent sealant from spreading to the reference electrode. Further, the carbon dioxide measurement device of the present invention is advantageous in that the shape of the heat-emitting pattern is prevented from deforming under high-temperature operation because of the use of a heating means formed with a heat-emitting-pattern protecting layer for protecting the heat-emitting pattern, and in that carbon dioxide concentrations can be measured in a stable fashion because the effect of the outside environment is minimised and a stable operating temperature is provided. Moreover, the carbon dioxide measurement device of the present invention is advantageous in that it allows enhanced productivity since the manufacturing operation is outstandingly reproducible and it can readily be mass-produced, and in that a high level of durability can be obtained.

Classes IPC  ?

• G01N 27/26 - Recherche ou analyse des matériaux par l'emploi de moyens électriques, électrochimiques ou magnétiques en utilisant l'électrolyse ou l'électrophorèse
• G01N 27/407 - Cellules et sondes avec des électrolytes solides pour la recherche ou l'analyse de gaz
• G01N 27/00 - Recherche ou analyse des matériaux par l'emploi de moyens électriques, électrochimiques ou magnétiques

Abrégé

The present invention provides a nitrogen-oxide gas sensor that is able to measure nitric oxide and nitrogen dioxide at the same time and ensure measurement accuracy and long stability. The present invention relates to the nitrogen-oxide gas sensor that includes: an oxide ion conductive solid electrolyte; a primary film made of a metal oxide which contacts the solid electrolyte; a secondary film made of a metal oxide that contacts with the solid electrolyte and is separated from the first film; a power source that applies electric power to the primary and secondary films by electrically connecting a primary node to the primary film and a secondary node to the secondary film; a tertiary film made of a metal oxide that contacts the solid electrolyte, wherein the tertiary film and the primary film are connected to the power source in parallel; and a measurement unit that measures the electric potential difference between the primary and secondary nodes.

Classes IPC  ?

• G01N 27/407 - Cellules et sondes avec des électrolytes solides pour la recherche ou l'analyse de gaz
• G01N 27/417 - Systèmes utilisant des cellules et des sondes à électrolyte solide
• G01N 27/414 - Transistors à effet de champ sensibles aux ions ou chimiques, c. à d. ISFETS ou CHEMFETS
• H01L 29/786 - Transistors à couche mince
• H01L 29/06 - Corps semi-conducteurs caractérisés par les formes, les dimensions relatives, ou les dispositions des régions semi-conductrices
• G01N 27/26 - Recherche ou analyse des matériaux par l'emploi de moyens électriques, électrochimiques ou magnétiques en utilisant l'électrolyse ou l'électrophorèse
• G01N 27/12 - Recherche ou analyse des matériaux par l'emploi de moyens électriques, électrochimiques ou magnétiques en recherchant l'impédance en recherchant la résistance d'un corps solide dépendant de la réaction avec un fluide

Abrégé

The present invention provides a nitrogen-oxide gas sensor that is able to measure nitric oxide and nitrogen dioxide at the same time and ensure measurement accuracy and long stability. The invention provides a nitrogen-oxide gas sensor that includes: a primary oxide ion conductive solid electrolyte; a primary film that contacts the solid electrolyte and is made of a metal oxide; a secondary film that contacts the solid electrolyte and is made of a metal oxide; a power source that applies electric power to the primary and secondary films by electrically connecting a primary node to the primary film and a secondary node to the secondary film; a measurement unit that measures the electric potential difference between the primary and secondary nodes; and a temperature control unit that maintains the temperature of at least one of the primary and secondary films constantly.

Classes IPC  ?

• G01N 27/407 - Cellules et sondes avec des électrolytes solides pour la recherche ou l'analyse de gaz
• G01N 27/417 - Systèmes utilisant des cellules et des sondes à électrolyte solide
• H01L 29/786 - Transistors à couche mince
• H01L 29/06 - Corps semi-conducteurs caractérisés par les formes, les dimensions relatives, ou les dispositions des régions semi-conductrices
• G01N 27/12 - Recherche ou analyse des matériaux par l'emploi de moyens électriques, électrochimiques ou magnétiques en recherchant l'impédance en recherchant la résistance d'un corps solide dépendant de la réaction avec un fluide
• G01N 27/414 - Transistors à effet de champ sensibles aux ions ou chimiques, c. à d. ISFETS ou CHEMFETS

Abrégé

The present invention provides a nitrogen-oxide gas sensor that is able to measure nitric oxide and nitrogen dioxide at the same time and ensure measurement accuracy and long stability. For these purposes, the nitrogen-oxide gas sensor includes: an oxide ion conductive solid electrolyte; a primary film that contacts the solid electrolyte and is made of a p-type semiconductor metal oxide; a secondary film that contacts the solid electrolyte and is made of a p-type semiconductor metal oxide; an n-type semiconductor metal oxide that is included in at least one of the primary and secondary films; a power source that applies electric power to the primary and secondary films by electrically connecting a primary node to the primary film and a secondary node to the secondary film; and a measurement unit that measures the electric potential difference between the primary and secondary nodes.

Classes IPC  ?

• G01N 27/407 - Cellules et sondes avec des électrolytes solides pour la recherche ou l'analyse de gaz
• G01N 27/417 - Systèmes utilisant des cellules et des sondes à électrolyte solide
• G01N 27/414 - Transistors à effet de champ sensibles aux ions ou chimiques, c. à d. ISFETS ou CHEMFETS
• H01L 29/786 - Transistors à couche mince
• H01L 29/06 - Corps semi-conducteurs caractérisés par les formes, les dimensions relatives, ou les dispositions des régions semi-conductrices
• G01N 27/12 - Recherche ou analyse des matériaux par l'emploi de moyens électriques, électrochimiques ou magnétiques en recherchant l'impédance en recherchant la résistance d'un corps solide dépendant de la réaction avec un fluide

Abrégé

Disclosed is a NOx sensor which gives an output of the same direction with respect to NO and NO2 with the same sensitivity, thereby precisely measuring total NOx concentration, and also which can be reacted with only NO2 according to a forming method of an oxide sensing electrode. The NOx sensor comprises an oxygen ion conductive solid electrolyte 10; one or more oxide sensing electrodes 20 formed at the oxygen ion conductive solid electrolyte 10; a first noble metal electrode 30 formed at the oxide sensing electrode 20; a second noble metal electrode 40 formed at the oxygen ion conductive solid electrolyte 10; and an electromotive force lead line 50 for the electrical connection of the oxide sensing electrode 20 and the second noble metal electrode 40. The oxide sensing electrode 20 and the second noble metal electrode 40 are connected in parallel to each other through the first metal electrode 30.

Classes IPC  ?

• G01N 27/407 - Cellules et sondes avec des électrolytes solides pour la recherche ou l'analyse de gaz
• G01N 27/12 - Recherche ou analyse des matériaux par l'emploi de moyens électriques, électrochimiques ou magnétiques en recherchant l'impédance en recherchant la résistance d'un corps solide dépendant de la réaction avec un fluide

Abrégé

This invention is about the new method of packaging the electrochemical carbon dioxide sensor and its concept of sensor-imbedded module as a replaceable part which contains the memory chip and the temperature sensor as a temperature compensation elements on the circuit board. The module consists of the electrochemical carbon dioxide sensor assembly containing the solid electrolyte carbon dioxide sensor, sensor support, heating element and cover, and the easily replaceable circuit board containing the memory chip and the temperature sensor.

Classes IPC  ?

• G01N 27/407 - Cellules et sondes avec des électrolytes solides pour la recherche ou l'analyse de gaz