CN111948338B

CN111948338B - Method for improving judgment of harmful gas detector

Info

Publication number: CN111948338B
Application number: CN201910402817.4A
Authority: CN
Inventors: 魏敬澄; 魏浚庭
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-05-15
Filing date: 2019-05-15
Publication date: 2022-06-24
Anticipated expiration: 2039-05-15
Also published as: CN111948338A

Abstract

The invention discloses a method for improving judgment of a harmful gas detector, which presets high-grade division for voltage difference between output signal voltage of the harmful gas detector and environment detection voltage, wherein each detection course of the harmful gas detector is formed by grabbing environment detection voltage for ten times and every microsecond continuously by a microprocessor, the detection course is carried out every ten seconds in timing detection, if the change of the environment detection voltage shows linear change, the timing detection enters an intensive detection state of detecting once per one tenth of one second, and the alarm is started when the three continuous detection courses show linear change, otherwise, the output signal voltage can be compensated and returned to the timing detection along with the change of the environment detection voltage, and the voltage difference between the two is kept at a certain value. The method can effectively improve the reaction and judgment speed of the harmful gas detector.

Description

Method for improving judgment of harmful gas detector

Technical Field

The invention relates to the field of harmful gas detection, in particular to a method capable of improving judgment of a harmful gas detector.

Background

In human sense of smell, the body senses cannot be used to distinguish the types of gases. Among the colorless and odorless gases, there are some gases harmful to the human body, such as carbon monoxide. When the carbon monoxide is excessively absorbed by human, the human is unconscious and fatalitic, and if the human can be detected by a gas detector and appropriately treated, the personal safety can be ensured; in addition, carbon dioxide and oxygen are closely related to the quality of human life, and a gas detector for detecting the concentration of carbon dioxide and oxygen is required in an air conditioning system, or the concentration of polluted gas is detected, so that the gas concentration can be adjusted according to the standard, or an air cleaner is started, which is sufficient for the importance of the gas detector on the improvement of human life comfort.

The so-called harmful gas detector is an element that converts the specific harmful gas (i.e. the gas to be detected) contained in the gas (generally air) into an appropriate electrical signal (voltage, current, resistance) for monitoring or metering. It is equivalent to the smell of animals and is commonly called as 'electronic nose'. The detection reaction of the harmful gas detector to the harmful gas can be used to output signal voltage (the higher the concentration of the harmful gas is, the lower the resistance of the harmful gas detector is, the higher the voltage is), and the alarm (such as a flashing light and a buzzer) is started to carry out alarm. When the conventional harmful gas detector is started, an environment detection voltage is generated, and when harmful gas is detected, a reaction is generated to change the voltage, and the detector does not start the alarm until the voltage reaches the value of the output signal voltage, so that a voltage difference exists between the environment detection voltage and the output signal voltage; secondly, the conventional harmful gas detector is used to compare the voltage and concentration relation curve of the harmful gas, as shown in fig. 1, to detect which kind of harmful gas generates signal voltage, so the response time is too long and insensitive, and it is difficult to meet the requirement of high safety.

In view of the above problems, the present inventors have found that the detection method of a harmful gas detector is difficult to respond quickly, and it is not necessary to detect the type of harmful gas for general household users, after all, once the harmful gas is found to appear, the alarm must be raised and the harmful gas must be removed, it is most important to reserve the extra time for safe disposal, and it is completely useless for general users to waste time to determine what kind of harmful gas is (and the specific harmful gas needs to be added with odorant according to the law). Therefore, the inventor of the present invention is actively developing and improving the professional manufacturing and design experience of the household safety and anti-theft device for many years, and finally developing the determination method of the present invention under the judicious consideration of each condition, so as to effectively improve the reaction and determination speed of the harmful gas detector.

Disclosure of Invention

In view of the deficiencies of the prior art, the object of the present invention is to provide a method for increasing the response and judgment speed of a harmful gas detector.

In order to achieve the purpose, the invention adopts the technical scheme that:

a method for improving judgment of harmful gas detector includes such steps as presetting high-divided intervals for the voltage difference between output signal voltage and environment detection voltage, using microprocessor to capture each environment detection voltage for each microsecond, carrying out detection process every ten seconds in timing detection, making the timing detection enter concentrated detection for one tenth of one second when environment detection voltage is changed linearly, starting alarm when three times of continuous concentrated detection processes are changed linearly, or compensating output signal voltage along with change of environment detection voltage and restoring to timing detection to make the voltage difference between them maintain a certain value.

Further, the high-equally cut is a hundredth of an equal.

The invention has the beneficial effects that:

the invention provides a method for improving the judgment of a harmful gas detector, which carries out the timing detection of high-grade cutting on the voltage difference between the output signal voltage of the harmful gas detector and the environment detection voltage, and entering into dense detection when the change of the environment detection voltage shows linear change, starting the alarm only when the detection course of continuous three times of dense detection shows linear change, otherwise judging the natural change (non-linear change) along with the change of temperature and humidity, at the moment, the microprocessor makes the output signal voltage compensate and return to the timing detection along with the change of the environment detection voltage, and makes the voltage difference between the two keep a certain value, therefore, the invention can immediately send out warning when detecting harmful gas, greatly improves the reaction and warning speed of the detector, and can further avoid false alarm caused by the increase of detection voltage caused by temperature and humidity.

Drawings

FIG. 1 is a graph of voltage versus concentration for a conventional harmful gas detector.

FIG. 2 is a graph showing the relationship between voltage and time of the harmful gas detector according to the present invention.

Detailed Description

To further understand the technical solution of the present invention, the following preferred embodiments are specifically illustrated in the following drawings, and the following detailed description is made in order to achieve the above objects and effects:

a method for improving the judgment of a harmful gas detector is mainly to preset high-level cutting for the voltage difference between the output signal voltage of the harmful gas detector and the environment detection voltage (in the invention, the voltage difference is cut by one hundred levels), the detection process of each detector is formed by a microprocessor grabbing the environment detection voltage for each microsecond for ten times continuously, the detection process is carried out every ten seconds in the timing detection, if the time and voltage relation comparison graph of the environment detection voltage shows linear change, as shown in figure 2, the timing detection enters an intensive detection state of detecting once in one tenth of a second, and the detection process of the intensive detection for three times continuously shows linear change, an alarm is started (the design of the harmful gas detector originally generates electric signal change aiming at the existence of harmful gas), otherwise, it is determined that the environment naturally changes (non-linear change) along with the change of temperature and humidity, at this time, the microprocessor makes the output signal voltage compensate and recover the timing detection along with the change of the environment detection voltage, so as to make the voltage difference between the two keep a certain value, for example, when the environment detection voltage is set to be lower than the output signal voltage by 0.5 volt, and when the microprocessor obtains the environment detection voltage which changes by 0.1 volt along with the change of temperature and humidity, the microprocessor makes the output signal voltage relatively change by 0.1 volt, so that the environment detection voltage keeps a state lower than the output signal voltage by 0.5 volt, thereby avoiding the generation of false alarm due to the increase of the detection voltage caused by temperature and humidity, the microprocessor compensates the environment detection voltage, and the environment naturally changes along with the change of temperature and humidity, so that no additional temperature sensor is needed, A humidity sensor.

Claims

1. A method for improving judgment of a harmful gas detector is characterized in that voltage difference between output signal voltage of the harmful gas detector and environment detection voltage is preset to be high and equally divided, each detection process of the harmful gas detector is formed by a microprocessor grabbing environment detection voltage for ten times of every microsecond, a detection process is carried out every ten seconds in timing detection, when the change of the environment detection voltage shows linear change, the timing detection enters dense detection of one tenth of one second, and when the detection process of continuous three times of dense detection shows linear change, an alarm is started, otherwise, the output signal voltage can be compensated along with the change of the environment detection voltage and returns to the timing detection, and the voltage difference between the output signal voltage and the environment detection voltage is kept at a certain value.

2. The method of claim 1, wherein the high-level cut is a hundred.