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Multiple Light Emitting Diodes
LEDM with two different emitting elements (chips) in TO-18 package have been developed by IBSG Company for detection of various gases. LEDM includes a measuring emitting chip with wavelength λ1, as well as a reference emitting chip with wavelength λ2. The Company offers different combinations of elements as the technical problems require. Manufacturing of multiple LEDs is made to individual order.
Figures present the spectral characteristics and the power vs. current dependence for the two-element LEDM designed for the detection of CO2. LEDM4337 consists of two emitting elements: measuring chip (LED43, λ=4.3 μm) and reference chip (LED37, λ=3.7 μm). The elements can be connected independently of each other.
| Model* | Measuring wavelength λ1, µm | Reference wavelength λ2, µm | Detected gas | |
|---|---|---|---|---|
| LEDM1915 | 1.94 | 1.55 | steam | H2O |
| LEDM2015 | 2.06 | 1.55 | ||
| LEDM2315 | 2.34 | 1.55 | methane | CH4 |
| LEDM3429 | 3.34 | 2.9 | ||
| LEDM3629 | 3.6 | 2.9 | formaldegide | CH2O |
| LEDM3829 | 3.8 | 2.9 | hydrogen sulphide | H2S |
| LEDM4337 | 4.27 | 3.7 | carbon dioxide | CO2 |
| LEDM4637 | 4.67 | 3.7 | carbon monoxide | CO |