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Sensors (Basel). 2019 Jan 7;19(1). pii: E188. doi: 10.3390/s19010188.

Highly Sensitive Diode-Based Micro-Pirani Vacuum Sensor with Low Power Consumption.

Wei D1,2, Fu J3,4, Liu R5, Hou Y6, Liu C7,8, Wang W9,10, Chen D11,12.

Author information

1
Smart Sensing Research and Development Centre, Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029, China. weidebo@ime.ac.cn.
2
School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100029, China. weidebo@ime.ac.cn.
3
Smart Sensing Research and Development Centre, Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029, China. fujianyu@ime.ac.cn.
4
School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100029, China. fujianyu@ime.ac.cn.
5
Smart Sensing Research and Development Centre, Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029, China. liuruiwen@ime.ac.cn.
6
Smart Sensing Research and Development Centre, Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029, China. houying@ime.ac.cn.
7
Smart Sensing Research and Development Centre, Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029, China. liuchao@ime.ac.cn.
8
School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100029, China. liuchao@ime.ac.cn.
9
Smart Sensing Research and Development Centre, Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029, China. wangweibing@ime.ac.cn.
10
School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100029, China. wangweibing@ime.ac.cn.
11
Smart Sensing Research and Development Centre, Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029, China. dpchen@ime.ac.cn.
12
School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100029, China. dpchen@ime.ac.cn.

Abstract

Micro-Pirani vacuum sensors usually operate at hundreds of microwatts, which limits their application in battery-powered sensor systems. This paper reports a diode-based, low power consumption micro-Pirani vacuum sensor that has high sensitivity. Optimizations to the micro-Pirani vacuum sensor were made regarding two aspects. On the one hand, a greater temperature coefficient was obtained without increasing power consumption by taking advantage of series diodes; on the other hand, the sensor structure and geometries were redesigned to enlarge temperature variation. After that, the sensor was fabricated and tested. Test results indicated that the dynamic vacuum pressure range of the sensor was from 10-1 to 10⁴ Pa when the forward bias current was as low as 10 μA with a power consumption of 50 μW. Average sensitivity was up to 90 μV/Pa and the sensitivity of unit power consumption increased to 1.8 V/W/Pa. In addition, the sensor could also work at a greater forward bias current for better sensor performance.

KEYWORDS:

diode; highly sensitive; low power consumption; micro-Pirani vacuum sensor

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