New optoelectronic devices for the Mid-Infrared spectral range open completely new possibilities for portable sensors creation. Using Mid-infrared LED-PD optopairs allows developing an instrument that is smaller, less expensive and versatile.

Medical Applications

Nowadays medical diagnosis, treatment and prevention of diseases require contemporary, precise and reliable medical instruments. We offer new optical sensing tools based on mid-infrared LED-PD optopairs that can be used in a vast number of medical applications.

Our devices can be used in solving the following medical problems:
• Respirometry (CO2 concentration measurement in breathed out air):
Carbon dioxide has the main absorption band at 4200-4300 nm (the data are taken from HITRAN Catalogue). So, we recommend using light emitting diode Lms43LED and Lms43PD series photodiode.

Spectra of LEDs and PDs for CO2 detection:

• Analysis of blood, tissues, skin absorption (non-invasive glucose measurement etc.):
Creation of a compact scanner based on multi-element mid IR LED-array will enable scanning of a certain spectral range within several seconds, defining absorption properties of the analysed matter and detecting the existence of some deviations from the normal levels.
Measuring of glucose absorption based on control of one or two peak wavelengths may not provide reliable results due to the influence of fat, hemoglobin, water and other substances on the measuring signal. Only complex analysis of the absorption spectrum can provide good selectivity and reliability of glucose measurements.

Absorption of IR radiation in blood, tissues, skin:

Advantages of our devices:
✔  Non-invasive analysis
✔  Possibility to arrange a compact design of an optical cell thanks to compact size of the LED chip – 0.35 × 0.35 mm
✔  No need of using additional optical filters – LED emission band width is comparable to absorption band width of CH4
✔  Low power consumption (<1 mW)
✔  Short response time (10‒50 ns)
✔  Possibility to achieve modulation ranges of up to 100 MHz
✔  Operation temperatures up to +150°C
✔  Lifetime of 80 000 hours

LED-PD based evaluation systems and analysers for medical applications
For quick start we offer out-of-the-box solutions that can be launched with minimal effort – evaluation kits and systems:
UDK universal evaluation kit with modular design that includes:
- Light emitting diodes LmsXXLED (other LED is available) with an LED driver
- Photodiode Lms43PD-03 (other PD is available) with a preamplifier
- SDM synchronous detector
- Any additional component(s) can be added by request

CDK evaluation kit for CO2 detection with modular design that includes:
- Light emitting diodes Lms43LED (any LMSNT LED can be chosen) with an LED driver
- Spectrally-matched photodiode LmsXXPD-XX (any PD can be chosen) with a preamplifier
- SDM synchronous detector
- Any additional component(s) can be added by request

NEW CDK-c evaluation kit for CO2 detection with modular design that includes:
- LED Lms43LED-CG (LED with a special glass covering) with an LED driver
- Photodiode Lms43PD-CG (PD with a special glass covering) with a preamplifier
- SDM synchronous detector
- Any additional component(s) can be added by request

COMING SOON CDS-5 system for CO2 detection with a compact optical cell that incorporates an LED and a photodiode with a special glass covering. It includes all the needed circuitry for quick setup: LED driver, photodiode preamplifier, synchronous detector.

COMING SOON СDS-4 CO2 sensor module – a low-cost “on-board” system with very low power consumption that includes a compact optical cell and electronics for LED power supply and PD signal amplification all-in-one.

NEW LA-T LED Analyser a device oriented for the initial experiments with different liquid (and other) substances, enables defining the absorption properties of the analyzed sample in the spectral range 1.3 – 2.3 µm.
LA-1t’s optical module includes:
- 8-element LED array with peak emission wavelengths about 1.3, 1.4, 1.6, 1.7, 1.9, 2.1, 2.2 and 2.3 µm;
- Wideband photodiode with a cut-off wavelength about 2.4 µm and 2 mm sensitive area diameter;
- ZigBee/Bluetooth wireless data transmission module for fast data transfer to a data control center;
- Battery power supply for autonomous operation.

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