A sewage harmful gas sensor and method
A harmful gas and sensor technology, applied in the field of the Internet of Things, can solve problems such as battery damage, inconvenient battery power supply maintenance, and environmental pollution, and achieve the effects of long life, inconvenient power supply maintenance, and strong anti-interference ability
Active Publication Date: 2019-03-08
BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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[0003] This application proposes a sewage harmful gas sensor and method to realize passive and wireless harmful gas sensing, solve the problems of inconvenient battery power supply maintenance and battery damage and pollute the environment, and reduce personnel injuries
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[0021] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in conjunction with specific embodiments of the present application and corresponding drawings. Apparently, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.
[0022] The invention discloses a multi-type interdigital transducer (interdigital transducer, IDT) sewage harmful gas sensor based on surface acoustic wave technology, which mainly includes four parts: a piezoelectric substrate, an input interdigital transducer, and an output interdigital transducer. transducer and sensitive membrane. The piezoelectr...
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Abstract
The invention provides a sewage harmful gas sensor and a method. The sensor comprises an input interdigital transducer, multiple output interdigital transducers, multiple sensitive membranes and a piezoelectric substrate; the sensitive membranes absorb harmful gas molecules, the sequence of the output interdigital transducers is set to be gradually reduced according to the electromechanical coupling coefficient, and the output interdigital transducers are sequentially arranged in the propagation direction within the forward sound wave effect range and distributed and arranged in the vertical propagation direction; the sequence of the sensitive membranes is set to be gradually reduced on the damping effects of sound waves, each syn-position sensitive membrane is located between the input interdigital transducer and the output interdigital transducer located on the same syn-position according to the sequence in the forward sound wave propagation direction. The sewage harmful gas sensing method comprises the following steps that a query pulse is sent to the sensor; multiple forward pulses and multiple delay pulses which are sent by the sensor are received; time intervals corresponding to the forward pulses and the delay pulses are measured in sequence, and the concentration of harmful gas is measured according to the size of each time interval.
Description
technical field [0001] The present application relates to the technical field of the Internet of Things, in particular to a sensor for detecting harmful gases in sewage pipelines. Background technique [0002] In the sewage pipeline, harmful gases can be generated or exist in various clear water pools, concentration pools, underground sewage, sludge gate wells, stagnant sewage pools, and disinfection facilities, which are divided into toxic gases, corrosive gases, and flammable and explosive gases. Three types of gases. Toxic gases are gases that cause harm to other tissues and organs inside the human body through the human respiratory organs, such as hydrogen sulfide, carbon monoxide and other gases. Corrosive gases generally include ammonia gas, chlorine gas, ozone gas, chlorine dioxide gas, etc., which are corrosive to the human respiratory system and are poisonous. Inflammable and explosive gases are mixed with air to produce a certain proportion, and when they encount...
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IPC IPC(8): G01N29/02
CPCG01N29/022G01N2291/0215
Inventor 陈涛杨帆甄玉龙徐正山王旭马玉林高杰
Owner BEIJING INST OF RADIO METROLOGY & MEASUREMENT