Non-contact temperature and humidity sensor and detection method

Abstract

The invention discloses a non-contact temperature and humidity sensor and a detection method. The sensor comprises an interdigital capacitor, a resistor, a spiral inductor and a flexible substrate, the flexible substrate is provided with a through hole used for installing the resistor, the interdigital capacitor and the spiral inductor are installed on the two side faces of the flexible substraterespectively, the resistor is installed in the through hole, and the interdigital capacitor, the resistor and the spiral inductor are connected in series. According to the sensor, simultaneous monitoring of temperature and humidity is realized by using an LC wireless passive sensing technology; the sensor has the advantages of being simple in manufacturing process, good in linearity, high in sensitivity, simple in circuit, low in energy consumption, long in service life and the like, is small in size, simple in structure and convenient to install, can be easily connected to various surfaces, is very suitable for wearable equipment and portable electronic products, and can also normally operate under dangerous or special conditions.

Description

technical field [0001] The invention belongs to the technical field of sensors and relates to passive sensors, in particular to a non-contact temperature and humidity sensor and a detection method. Background technique [0002] Temperature and humidity have always been the more important environmental factors that people care about, and they are also more important in physical and chemical experiments and material production activities. Therefore, temperature and humidity sensors are widely used in industrial and agricultural production, cold chain logistics, food preservation, health care, wearable devices, environmental monitoring and many other occasions. However, in some special cases, wired active temperature and humidity sensors will have some problems and challenges. For example, to measure temperature and humidity in a closed container, if a wired active sensor is used, it needs to be measured by punching holes, which cannot guarantee the airtightness of the closed ...

AI Technical Summary

Problems solved by technology

Such as: (1) Lu Wen, etc., North University of China designed a LC wireless passive humidity sensor based on MoS2 / PI (polyimide) (Lu Wen, Tan Qiulin. A LC wireless passive sensor for humidity monitoring Preparation and testing of [J]. Micro-Nano Electronics Technology, 2019, 56(3): 211-217); (2) Zhang Cong of Southeast University designed a LC wireless sensor with graphene and polyimide as sensitive materials Passive humidity sensor (Zhang Cong, LC-type passive wireless humidity sensor theory and experimental research, doctoral dissertation in 2014); (3) Lu Wen, North University of China, etc. designed a LC wireless passive sensor based on two-dimensional sulfide materials Humidity sensor research (Lu Wen, LC wireless passive humidity sensor research based on two-dimensional sulfide materials [D]. Shanxi: North University of China Instrument Science and Technology. 2019); (4) Chongqing University Luo Tao et al. developed an iron-based Electroceramic LC temperature sensor (Luo Tao, Tan Qiulin, Wei Tanyong, Xiong Jijun. A review of the research status and development trend of passive LC sensors [J]. Sensors and Microsystems, 2014, 33(9): 11-14.); The problems of the LC wireless passive sensing material developed above mainly include: the response time is too long; the detection range is too narrow; the adsorption time and desorption time are too long, resulting in a slow response time

In addition, currently involved LC passive wireless sensors can only detect one parameter of temperature or humidity

Images