公开(公告)号：US20210132017A1

公开(公告)日：2021-05-06

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: G01N33/00 ,  G01N27/04

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 one of a current mode, a resistance mode, and 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 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：US20200166547A1

公开(公告)日：2020-05-28

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: G01R15/00 ,  G01R27/02

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.