TWI660170B - Method for improving judgment of harmful gas detector - Google Patents

Abstract

The invention relates to a method for improving the judgment of a harmful gas detector, which mainly makes a preset high-level cutting of the voltage difference between the output signal voltage of the harmful gas detector and the environmental detection voltage. The detection process is composed of a microprocessor capturing ten consecutive environmental detection voltages every microsecond. The detection process is performed every ten seconds in the timing detection. If there is a change in the environmental detection voltage, it will show a linearity. When it changes, it will make the timed detection enter the dense detection state of one tenth of a second detection, and the alarm will be activated when the detection process shows a linear change for three consecutive times, otherwise the output signal voltage can be detected with the environment. The voltage change is measured to compensate and return to the timing detection, so that the voltage difference between the two is maintained at a certain value.

Description

Method for improving judgment of harmful gas detector

The invention relates to a method for improving the judgment of a harmful gas detector, which mainly makes the detection process of the harmful gas detector consist of an environment detection voltage captured by a microprocessor, and changes linearly to the changed value. The detection voltage is densely detected, and the alarm is activated when the detection process of the three consecutive dense detections shows a linear change, otherwise the output signal voltage can be compensated and the timing detection is restored as the environmental detection voltage changes. , Urge the harmful gas detector to compensate for changes in temperature and humidity, and improve the detection response to harmful gases.

As far as human smell is concerned, it is impossible to use the senses of the body to distinguish what the gas is. Among the colorless and odorless gases, there are some gases that are harmful to the human body, such as carbon monoxide. When humans absorb too much, they will cause coma and lethality. If they can be detected by a gas detector, appropriate treatment will be performed. It can ensure personal safety; in addition, carbon dioxide and oxygen are closely related to the quality of human life. In the air-conditioning system, a gas detector that detects the concentration of carbon dioxide and oxygen must be used, or the concentration of polluted gas must be detected in order to adjust the gas concentration according to standards or start The air cleaner shows the importance of gas detectors for improving the comfort of human life.

The so-called harmful gas detector is to convert the specific harmful gas (ie, the gas to be measured) contained in the gas (generally refers to the air) into an element that can be monitored or measured with an appropriate electrical signal (voltage, current, resistance). Equivalent to the smell of animals, commonly known as "electronic nose".俾 The signal voltage (the concentration of harmful gas) can be output through the detection response of harmful gas detector to harmful gas The higher, the resistance of the harmful gas detector drops and the voltage rises), and a warning device (such as a flashing light and a buzzer) is activated for warning. However, the conventional harmful gas detectors all compare the voltage and concentration curve of the harmful gas (as shown in the first figure, which kind of harmful gas is detected) and send out the signal voltage, so the response time is too long and Insensitive, difficult to meet the requirements of high security use.

In view of the above problems, the present inventor is aware that the detection method of the conventional harmful gas detector is difficult to respond quickly, and the detection of the type of harmful gas is actually not necessary for ordinary household users. After all, once the harmful gas is found to occur It is necessary to increase alertness and eliminate it, and it is most important to reserve extra time for safe disposal. As for the waste of time to determine what kind of harmful gas, it is completely useless for ordinary users (and specific harmful gases) All need to add odorants in accordance with regulations). Therefore, the present inventor, with his many years of professional manufacturing and design experience in home security and anti-theft equipment, actively developed and improved. After careful consideration of the conditions of all parties, he finally developed the judgment method of the present invention, which can effectively improve the detection of harmful gases. Tester's response and judgment.

The invention relates to a method for improving the judgment of a harmful gas detector, which is mainly to preset the voltage difference between the output signal voltage of the harmful gas detector and the environmental detection voltage to a high-level division, and to linearly change the environment The detection voltage is densely detected, and the alarm is activated when the detection process of the three consecutive dense detections shows a linear change, otherwise the output signal voltage can be compensated and the timing detection is restored as the environmental detection voltage changes. To urge the harmful gas detector to compensate for changes in temperature and humidity, so the following benefits can be achieved after implementation: each detection process of the present invention is captured by the microprocessor ten consecutive times each It consists of microsecond environmental detection voltage, and the detection process is performed every ten seconds in the timing detection. If the change of the environmental detection voltage is a linear change, the timing detection is made. Entering the dense detection state of detecting once in tenths of a second, and the time-voltage comparison chart of three consecutive detection processes shows a linear change, it means that a harmful gas is detected and the alarm is activated, otherwise it is judged to be With the natural change of the temperature and humidity (non-linear change), at this time, the output signal voltage can be compensated by the microprocessor and the timing detection can be restored with the change of the environmental detection voltage, which promotes the voltage between the two. The difference maintains a certain value (for example, when the environmental detection voltage is set to be 0.5 volts lower than the output signal voltage, when the microprocessor obtains an environmental detection voltage that changes with temperature and humidity to cause a 0.1 volt change, the microprocessor makes the output signal The relative voltage changes by 0.1 volts, so that the environmental detection voltage remains lower than the output signal voltage by 0.5 volts), to avoid false alarms due to increased detection voltage caused by temperature and humidity.

The first figure: the relationship between voltage and concentration.

The second picture: the relationship between the voltage and time of the harmful gas detector.

In order to make your reviewers clearly understand the method of the present invention and the functional benefits it can achieve, the remaining examples are listed in conjunction with the drawings and described in detail as follows: The present invention is a method for improving the judgment of harmful gas detectors , Which mainly makes the voltage difference between the output signal voltage of the harmful gas detector and the environmental detection voltage a preset high-division cutting (in the present invention, this voltage difference has a 100-division cutting), detection Each detection process of the device is composed of the microprocessor capturing ten consecutive environmental detection voltages every microsecond, and the detection process is performed every ten seconds in the timing detection. When the time-voltage relationship comparison chart shows a linear change (as shown in the second figure), the timing detection will enter tenths. The dense detection state is detected once a second, and the detection process of three consecutive dense detections is linear when the alarm is activated (the design of the harmful gas detector is originally to generate electrical signals for the presence of harmful gases Change), otherwise it is judged that the environment changes naturally (non-linear change) with temperature and humidity change. At this time, the output signal voltage can be compensated by the microprocessor and the timing can be restored as the environmental detection voltage changes. Detect the voltage difference between the two to maintain a certain value (for example, when the environmental detection voltage is set to be 0.5 volts lower than the output signal voltage, when the microprocessor obtains the environmental detection voltage and changes 0.1 volts with temperature and humidity changes , The microprocessor causes the output signal voltage to change by 0.1 volts, so that the environmental detection voltage remains lower than the output signal voltage by 0.5 volts) to avoid false alarms due to the increase in detection voltage caused by temperature and humidity (by Compensation of the environmental detection voltage by the microprocessor. The environment changes naturally in response to changes in temperature and humidity, so there is no need to set additional temperature sensors and humidity sensors. Reactor).

Claims (2)

A method for improving the judgment of a harmful gas detector is mainly to preset a high-level cutting of the voltage difference between the output signal voltage of the harmful gas detector and the environmental detection voltage. Each detection process of the harmful gas detector It consists of a microprocessor that captures the environmental detection voltage for ten consecutive microseconds. The detection process is performed every ten seconds in the timing detection, and when the change of the environmental detection voltage shows a linear change, Make the timing detection enter the dense detection once every tenth of a second, and activate the alarm when the detection process of three consecutive dense detection shows a linear change, otherwise the output signal voltage can be detected with the environment The change in voltage compensates and restores the timing detection, so that the voltage difference between the two is maintained at a certain value. The method for improving the judgment of a harmful gas detector as described in item 1 of the scope of patent application, wherein the high-division cutting system is a hundred-division.