Non-Contact Infrared Temperature Measurement
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The 1st three statements are “a must” but even the others are important with respect to the wanted functionality of the camera. There are only few solutions on the market, Ethernet met all requirements best. For this reason, the camera has a integrated Fast Ethernet data interface. Using the internet protocol (IP) family the camera can be easily connected to standard PCs using common network infrastructure and accessories. A loss free data compression is implemented to reduce the data rate to approximately 40 to 50 MBit/sec and allow the use of the well introduced 100 Mbit Fast Ethernet network.
Additional a tiny web-server resides inside the camera, enabling it to communicate with all known web-browsers. The web server delivers information about the camera, can be used for controlling and configuration purposes and is able to perform a firmware update easily.
1.3 Camera Housing and Lens
The housing contains all camera components except the lens. It is a rugged design and made from stainless steel. There are no external control elements like buttons, displays etc. only two connectors on the rear side of the camera, thus allowing for easy installation. A 12 pin connector provides the connection for the power supply and the digital inputs and outputs. A standardized M12D connector provides the industrial Fast Ethernet connection.
Fig. 2: High Temperature IR-Imager
The camera can be mounted inside a cooling tube in connection with a bore scope lens and an air purge nozzle. The bore scope lens keeps the camera away from the very hot end of the cooling tube and offers a wide field of view that can facilitate the inspection over a wide area within a furnace. The cooling tube has a very small hole (<=4mm diameter) in front of the bore scope lens, allowing the necessary radiation to enter it while maintaining a cooler environment for the IR camera. A slight overpressure inside the tube, provides a continuous air flow out through the hole and keeps it free of dust. For severe environments the hole can be designed as a nozzle (refer to fig. 4) to intensify the air purge. The cooling tube has got two connections for the cooling water (inlet, outlet).
Fig. 3: Cooling tube with water connectors (up), Camera with bore scope lens, assembly pole, air and electrical connectors (down)
Fig. 4: Head of bore scope lens (left, foreground), Tip of the cooling tube with hole and air nozzle (right, background)
1.4 Technical data
The resulted camera meets the following technical specifications:
|
Spectral Range |
0.8 μm to 1.1 μm |
|
Temperature Measurement Range1 |
600 °C to 1500 °C, optional 2500 °C |
|
Sensor |
high dynamic 2D Si CMOS array (640 × 480 pixels) |
|
Lens1 |
32° × 24°, spatial resolution 0.9 mrad, optional 46° × 35°, spatial resolution 1.3 mrad, optional 23° × 17°, spatial resolution 0.6 mrad, optional bore scope lens 71° × 55°, spatial resolution 1.9 mrad |
|
Measurement Uncertainty2 |
0.5 % of the measured value in °C |
|
Noise equivalent temperature difference2 |
<2 K (600 °C, 25 Hz) |
|
Measurement Frequency |
internal 25 Hz, selectable: 25 Hz, 12.5 Hz, 6.25 Hz, … |
|
Response Time |
internal 80 ms , selectable: 2 / measurement frequency |
|
Interface |
Fast Ethernet (real-time) |
|
Digital Inputs |
2 electrically isolated digital inputs (trigger) |
|
Digital Outputs |
2 electrically isolated digital outputs (alarm, error) |
|
Connectors |
round plug connector HR10A (12 pins, power supply, digital inputs and digital outputs), round plug connector M12-L (Ethernet) |
|
Power Supply |
10 V to 36 V DC, typical 3 VA |
|
Housing |
60 mm × 60 mm × 160 mm (camera stainless steel housing without lens), optional With weatherproof housing or furnace probe lens with cooling jacket (IP65), incl. retract unit, auto-closure device, control and supply cabinet and other accessories |
|
Operating Temperature Range |
–10 °C to 50 °C (without water-cooling), –25 °C to 150 °C (with water-cooling) |
|
Storage Conditions |
–20 °C to 70 °C, rel. humidity 95 % max |
|
Software |
Control and imaging software THERMALSOFT for Windows ® |
Tab. 1: Technical data of the “High Temperature IR-Image with wide dynamic range
1 Other available.
2 Specification for black body reference and ambient temperature 25 °C.
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