October 9, 2018

Infrared Thermal sensor technology

The thermal imaging camera consists of 5 parts:

1. Infrared lens: receiving and concentrating infrared radiation emitted by the measured object;

2, infrared detector component: the heat radiation model into an electrical signal;

3. Electronic components: processing electrical signals;

4. Display component: converts an electrical signal into a visible light image;

5. Software: Process the collected temperature data and convert it into temperature readings and images.

Classification of infrared thermal imagers

Thermal imaging cameras are classified into cooling and uncooled according to operating temperature.

cooled Thermal Imager: A cryocooler is integrated into the detector. This device can lower the temperature of the detector. This is to make the thermal noise signal lower than the imaging signal and the imaging quality is better.

Uncooled thermal imager: The detector does not require cryogenic refrigeration. The detectors used are usually based on micro-bolometers, mainly polysilicon and vanadium oxide detectors.

Thermal imaging cameras are classified into temperature-measuring and non-temperature-measuring types according to their functions.

Temperature measuring type infrared camera: Temperature measuring type infrared camera can read the temperature value of any point on the surface of the object directly from the thermal image. This system can be used as a non-destructive testing instrument, but the effective distance is relatively short.

Non-temperature measuring type infrared camera: Non-temperature measuring type infrared camera can only observe the difference of heat radiation on the surface of the object. This system can be used as an observation tool with a long effective distance.

Infrared thermal imager features

Infrared thermal imagers have the following distinctive features compared to general inspection equipment:

1, the thermal imager can measure the temperature of moving objects, and ordinary temperature measuring instruments are difficult to do this;

2, can use the microscope head to measure the temperature of a few microns or less;

3, can quickly diagnose the equipment;

4. It will not cause interference to the measured temperature field;

5, the temperature range is large, depending on the model, generally can measure the range of 0 °C – 2000 °C;

6, high sensitivity, according to different models, can distinguish the temperature difference of 0.1 ° C or even smaller;

7, safe to use, due to the non-contact of the measurement, the thermal imager is very safe to use.

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