Of course, the flame sensor can also be used to detect the brightness of light, but this sensor is particularly sensitive to flame.Flame sensor utilizationinfraredIt is very sensitive to flame, and specialInfrared receiver tubeTo detect the flame, and then convert the flame brightness into high and lowLevel signal, input to the central processing unit,a central processorMake corresponding program processing according to signal changes.
principle
Announce
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Flame sensor: It is composed of various combustion products, intermediates, high-temperature gases, hydrocarbons and high-temperature solid particles with inorganic substances as the main body.The thermal radiation of flame has gas radiation of discrete spectrum and solid radiation of continuous spectrum.The flame radiation intensity and wavelength distribution of different combustors are different, but in general, the near-infrared wavelength domain andultravioletThe flame sensor can be made according to its high radiation intensity
Far infrared flame sensor
Function purpose:Far-infraredFlame sensors can be used to detect fire sources or other heat sources with wavelengths in the range of 700 nm~1000 nm.In robot competition, the far infrared flame probe plays a very important role. It can be used as a robot's eye to find fire or soccer.It can be used to make fire-fighting robots, soccer robots, etc.
Principle introduction: far-infrared flame sensor can detectinfrared lightThe detection angle is 60, and the sensitivity reaches the maximum when the infrared wavelength is near 880 nm.The far-infrared flame probe converts the intensity change of the external infrared light into the change of the currentA/D converterIt is reflected as the change of value in the range of 0~255.The stronger the external infrared light, the smaller the value;The weaker the infrared light, the greater the value.
UV flame sensor
Ultraviolet flame sensor can be used to detect the emission of fire source below 400 nmthermal radiation。Principle introduction: through the ultraviolet light, the detection angle can be set according to the actual situation, and the ultraviolet transmission can be visible absorption glass（filter）It can detect the wavelength in the range of 400 nm and the infrared wavelength in the range of 350 nm, and its sensitivity reaches the maximum.The ultraviolet flame probe converts the intensity change of the external infrared light into the change of the current, which is reflected by the A/D converter as the value change in the range of 0~255.The stronger the external ultraviolet light, the smaller the value;The weaker the UV light, the greater the value.
instructions
Pay attention to the following points when installing the far infrared flame sensor:
a，Put the robot onPhotosensitive sensorRemove it, and then connect the far-infrared flame sensor directly to the photosensitive interface.
b，Far infrared flame sensorContact pinIt has polarity. When installing, connect the red line to the position marked with "+" on the motherboard;If there is no response in use, just insert the sensor reversely.
c，During graphical programming, it is directly controlled by "brightness detection module";In code box programming,Using functionsPhoto (1) and photo (2) detection.
d，Far infrared flame probeworking temperature - 25centigrade~85 ℃. During use, the flame probe should not be too close to the flame to avoid damage.
