公开(公告)号：US11313844B2

公开(公告)日：2022-04-26

申请号：US16478623

申请日：2017-06-22

Applicant: ULSAN NATIONAL INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Jae Joon Kim ,  Subin Choi ,  Kyeong-Hwan Park

IPC: G01N27/04 ,  G01N33/00

Abstract: In a multi-channel resistance-based gas sensor system, the multi-channel array includes gas sensor channels respectively connected to resistive type gas sensors. The pre-processing unit selects a current mode, a resistance mode, or an external resistance mode, analyzes a sensing value obtained from any one of the gas sensor channels based on the selected mode and outputs a voltage value corresponding thereto. The analog-to-digital converter (ADC) converts the voltage value to digital data. The control unit controls the pre-processing unit to execute one of the current mode for analyzing a sensing value smaller than or equal to a preset first resistance value, the external resistance mode for analyzing a sensing value greater than or equal to a preset second resistance value greater than the preset first resistance value and the resistance mode for analyzing a sensing value between the preset resistance first value and the preset second resistance value.

公开(公告)号：US11372026B2

公开(公告)日：2022-06-28

申请号：US16672753

申请日：2019-11-04

Applicant: Ulsan National Institute of Science and Technology

Inventor： Jae Joon Kim ,  Subin Choi

IPC: G01R27/08 ,  G01R15/00 ,  G01R27/02 ,  G01R27/00 ,  G01R19/00

Abstract: A resistance measuring device includes an amplifying unit including an amplifier, a first and a second current supply unit, a voltage detection unit, and a controller. The controller controls the voltage detection unit to detect a first output voltage of an output terminal of the amplifier in a state where the current of the first current source flows in a forward direction to a measurement target resistor by controlling the first current supply unit, controls the voltage detection unit to detect a second output voltage of the output terminal of the amplifier in a state where the current of the second current source flows in a reverse direction to the measurement target resistor by controlling the second current supply unit, and calculates a resistance value of the measurement target resistor based on the detected first output voltage and the detected second output voltage.