This sensor formed the platinic accelerant design that struts stuff with pottery and porcelain on component of MEMS of pyroelectricity changeover type. Compare with the sensor photograph in the past, can develop the property of platinic accelerant more, have good sensitivity and durable sex consequently.
Once the chroma because of the hydrogen in air amounts to 4 ％ , with respect to meeting explosion, because this is hydric,divulge detect the technology needs hydric sensor to be able to arrive in Ppm class 4 ％ undertake high accuracy detect between limits of chroma of explosion limit of this one lowest. But, hydric sensor is in the osculatory combustion type previously and semiconductor type very hard Ppm arrives inside the big range of hundred undertake detecting.
For example, support of sensor of gas of osculatory combustion type detects the resistor change of signal sensor undertakes detecting, of area of because this is right high concentration detect more effective, but in low density area because sensitivity is low, cannot detect at all actually. Specific for, combustion hair thermal conductivity sends temperature to change when 0.01 ℃ , resistor change is 0.004 ％ only, cannot detect actually, because this cannot regard as,sensor is used.
The platinic accelerant film that hydric sensor changes cent of upside of film and its surface to form by pyroelectricity constitutes the pyroelectricity pattern of new development, the local difference in temperature that the calorific reaction of hydrogen and accelerant causes, use pyroelectricity to change velar changeover to be voltage signal. Consequently, should use high-powered pyroelectricity data to be finished with respect to attainable enough only detect the signal of the task.
What the sensor of new development uses is the working principle that catalytic reaction and photograph of pyroelectricity changeover function integrate, the tension that produces component itself is changed into signal, rose to be able to detect not only chroma limits, get not easily still the influence of external temperature. The hydric sensor that uses principle of this kind of job is in NEDO (technology of new energy industry develops an orgnaization integratedly) the industrial technology that develop considers to give aid to project- - the development of the new-style and hydric sensor that “ uses pyroelectricity oxide has developed a success in ” , but the sensor that wants to give out low cost, tall sensitivity, still need to develop miniaturization and compositive technology for sensor component, and small heater technology.
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