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| Main advantages of mid-IR LED in comparison with infrared heating sources are: |
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1. Fast response (nanoseconds - in heating sources seconds or milliseconds), so they can be modulated, can work in pulse regimes. This is very important advantage if Customer amplify signal from infrared detector synchronized with the LED modulation or LED pulses for receiving maximum signal to noise ratio. 2. Low electric power consumption, especially in pulse regimes. Customer can use 200 ns pulses and can obtain during the pulse peak optical power more then 60-100 mW (for LED16-LED23). In LEDs you use all radiation because they have narrow spectrum (practically the same width as absorption band of the gas). In heating IR sources you have very wide spectrum and cut with filters only small part of it, so you don't use the most part of heating radiation. 3. Small size. Size of the LED chips is only 0.3x0.3 mm or 0.5x0.5 mm. We can mount many LED chips in one package, or on any surface that is useful for the customer, so optical cell (even for 2-3 or more gases) can be few millimeters. It is not possible with infrared heating sources due to their bigger size, filters and therefore due to high heat dissipation. 4. Much longer lifetime. As usual for LEDs lifetime is 50000-80000 hours, while for heating sources it is usually hundreds of hours. 5. In mass production self cost of LEDs can be lower then self cost of heating sources because you don't need filters or other optical elements. Cost of semiconductor chips reduce very strongly with increasing volume (up to 100 times) while cost of optical and mechanical elements can be reduced only on percents. |