Ultra low power consumption infrared methane (CH4) and hydrocarbons (CnHm) gas sensors

MIPEX TECHNOLOGY's Products – Our Contribution to Your Successful Future

The technology used in our products allows to reach combination of low power consumption (50 times more effective than competitive analogues) and high efficiency. Moreover:

  • Long-term operation;
  • Ergonomics and operability;
  • Resistance to corrosion environment influence;
  • Resistance to destabilizing temperature factors.

Integrated solution with use of innovation methods in manufacture of materials and electronics together with unique capacity at peak efficiency of power consumption – we see such NDIR technology. And today we create such one for you.

Background

In its modern form NDIR technology is a result of long-term process of development, inspections and works of many professionals.

Devices based on NDIR (non-dispersive infrared) technology appeared in the second half of the 20thcentury. At that time optical gas analysis sensors were sufficiently bulky, as they required use of mechanical parts – a choppers: a rotating discs with built-in interference filters providing signal modulation from the lamp. But by the nineties the technological progress allowed to take considerable step forward and optical sensors obtained a number of significant improvements.

MIPEX_3D_modelThe first improved variant was developed in mid of 1990s by specialists of E2V company. A modern flashing lamp as IR source allowed disposing of mechanical chopper, on the other hand pyroelectric optical sensors as detectors allowed significantly reducing dimensions and sudden improving reliability. Pyroelectric detectors provided high specification stability at temperature change, as they had the same sensitivity within the whole spectral range. Besides, the high radiate power of the lamp within the measurement band provided possibility to obtain the required sensitivity characteristics of the sensor without use of mirror system; lamp signal power turned out to be sufficient for effective measurement of gas concentration provided by the light reflected from the walls of gas cell and accepted by pyroelectric optical sensor.

This technology of optical IR sensor has been certainly successful, it has proved reliability and was reproduced by several manufacturers with different modifications (in particular, by Dynament, Clair Air, CTL, etc.) and at present it is widely used by many companies in the world.

However, significant disadvantage of gas sensor, which operation is based on this technology, is demand of great power. Its excessively high power consumption (not less than 150...200 mW for methane detection) is a serious barrier for its further adaptation to needs of modern production: manufacturing of independent and unattended gas analyzers with wireless interface.

But the science forges ahead. Alternatively with this technology throughout the years in many countries, and mostly in Russia and UK, another optical technology of hydrocarbon gas analysis was developed. This technology was based on use of semiconductor elements: LEDs and photo diodes operating within spectral range 3000–4000 nm, as it is shown below.

Use of such technology allowed significant reducing power consumption of sensors; however, it needed a solution of three most important problems preventing its development until recently: temperature stability, long-term stability, and small dimensions.

We have solved these problems!

Small size of the sensor was obtained by using the systems of effective parabolic mini mirrors with high light transmission efficiency.

Sensor stability in conditions when characteristics (spectrum position, sensitivity and radiation power) of photo detectors and LEDs are subject to serious changes under the action of temperature, was supported by means of development of new LED types, which have optimized radiation spectrum and use of special signal processing algorithm. It provided high stability for sensor within operating temperature range.

Long-term stability of sensors was achieved by use of photo diodes specially developed for this project based on thin films of solid solutions for PbSe – CdSe system, which are about 10 times more sensitive than pyroelectric photo detectors and have incomparably higher stability both temperature and long-term ones comparing to photonic photo detectors of other types used earlier. We have developed, created and now commercially manufacture gas analyzing sensors by the unique revolutionary technology.

Nowadays

Innovations used in electrooptical components, materials, electronics open up new prospects of using our MIPEX sensors in industry, housing and public utilities, energy sector, coil, oil and gas production, transportation and storage.

We are proud of our product and propose it for you: it will provide required optimum of manufacturing and resource consumption, reliability margin and variability of operating conditions, possibility of further optimization and safety.