Dual heater gas sensor module
A dual heater gas sensor module according to an embodiment of the present invention comprises: a housing having a front side and a back side which are partially open and forming the exterior of the dual heater gas sensor module; a first gas sensor for heating the air flowing in through the front side of the housing; and a second gas sensor for measuring a specific gas contained in the air discharging through the backside of the housing, wherein the first gas sensor is located in a first region, the second gas sensor is located in a second region that is higher than the first region, and the first region and the second region may be connected by an inclined plane.
1. A dual heater gas sensor module comprising:
a housing comprising a front side in which an inflow hole, through which air is introduced, is defined and a rear side in which an outflow hole, through which air is discharged, is defined, the housing being configured to define an outer appearance of the dual heater gas sensor module;
a controller configured to control an operation of the dual heater gas sensor module;
a first gas sensor configured to heat the air introduced through the inflow hole of the front side of the housing, wherein the first gas sensor is not provided with a sensing material; and
a second gas sensor configured to measure a specific gas contained in the air discharged through the outflow hole of the rear side of the housing,
wherein air introduced through the inflow hole of the front side flows through a flow path within the housing to be discharged through the outflow hole of the rear side, wherein the flow path is defined by:
a first region horizontally connected to the inflow hole and comprising a first floor,
a second region horizontally connected to the outflow hole and comprising a second floor which is higher than the first floor, and
a third region connecting the first region and second region and comprising an inclined third floor between the first region and the second region,
wherein the first gas sensor is disposed at the first floor of the first region,
wherein the second gas sensor is disposed at the second floor of the second region, and wherein the controller is further configured to:
set a driving resistance value and a driving voltage value of each of the first gas sensor and the second gas sensor as offset values when the dual heater gas sensor module operates,
sense change of an external temperature,
read a resistance change value of the first gas sensor when the change of the external temperature is sensed, and
change the driving resistance value and the driving voltage value of the second gas sensor to correspond to the resistance change value of the first gas sensor.
2. The dual heater gas sensor module according to claim 1 , further comprising a micro pump installed on the front side of the housing and configured to allow the air introduced through the front side of the housing to move in a direction of the rear side of the housing.
3. The dual heater gas sensor module according to claim 1 , wherein the outflow hole of the rear side of the housing is disposed at a position higher than that of the inflow hole of the front side of the housing.
4. The dual heater gas sensor module according to claim 1 , wherein the outflow hole of the rear side of the housing has a size greater than that of the inflow hole of the front side of the housing.
5. The dual heater gas sensor module according to claim 1 , wherein the outflow hole of the rear side of the housing has a rectangular shape, and
the inflow hole of the front side of the housing has a circular shape.
6. The dual heater gas sensor module according to claim 1 , wherein the controller is further configured to: control the dual heater gas sensor module to maintain the driving resistance value and the driving voltage value of the second gas sensor when the change of the external temperature is not sensed.
7. The dual heater gas sensor module according to claim 1 , wherein a metal part configured to facilitate electrical connection between the first gas sensor and the second gas sensor is mounted on each of top and bottom sides of the housing.