Line scanners

All commercially available single-line scanners scan in object space so that wide-angle scanning can be accomplished. Probably the first approach to line scanning adopted commercially was in an aerial-type thermal mapper in which the line 

Significant recent developments in this area have made families of line cameras available, with a wide selection of linear FPA detectors based on the speed, resolution, and spectral sensitivity requirements of the process being monitored. 

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Collecting optics, radiation detectors and some form of indicator are the basic elements of an industrial infrared instrument. The optical system collects radiant energy and focuses it upon a detector, which converts it into an electrical signal. The instrument s electronics amplifies the output signal and process it into a form which can be displayed. There are three general types of instruments that can be used for predictive maintenance infrared thermometers or spot radiometers line scanners and imaging systems. 

Reticon Corporation, S-Series Solid State Line Scanners, Data Sheet. 

The basic near range sensors are the infrared and ultraviolet detectors, often coming together as IR/UV-sensor, in most cases in a line-scanner (LS) assembly. The IR/UV-LS is a passive bi-spectral remote sensor that is sensitive in the thermal infrared (TIR) between 8 and 14 pm and in the near ultraviolet (NUV) between 0.32 and 0.38 pm. At an aircraft altitude of 300 m its swath width amounts to approximately 500 m. This sensor on the one hand is used to measure the thermal emission of the sea surface in the TIR and on the other hand serves for the detection of highly reflecting... 

Use of IR line scanner to provide printout of surface water temperature along the flight track. 

The IR/UV line scanner is the same as AOSS, except the UV sensitivity will be increased by a factor of 10. The IR/UV will scan a line missed by the SLAR. It can differentiate between oil and false targets and is effective in calm water when SLAR is degraded. The IR portion provides a day or night capability. 

ScanIR, Line scanner thermal imager, Ircon, Inc. Schulaflex, Flexible elastomers, Schulman, A., Inc. 

Line scanner, which scans the beam in horizontal lines across the screen. Lines are traced at 15,000-70,000 times per second. The rotating polygon scanner is commonly used, featuring 24-60 mirrored facets. Figure 5.130 illustrates a mechanical rotating polygon scanner. 

FIGURE 5.130 Rotating polygon line scanner for a laser projector. 

Figure 2.18 Infrared line scanner schematic and scanner operafien.

When processes are in constant and uniform motion, an imaging system may not be required to cover the full process image. To monitor and control processes in motion, an IR line scanner can be used, scanning normal to the process flow, to generate a thermal strip map of the product as it passes the measurement site line (see Fig. 2.18). If more than one measurement site line is required, additional line scanners can be deployed. Alternately the line scanner can be set in motion to produce a thermal map of a nonmoving process, as shown in Fig. 10.3. 

Figure 10.7 Thermal image process control using a line scanner and set points (courtesy of FUR Systems, Inc.).

Figure 10.8 Full Image process control using a line scanner and multiple zones (a) before implementation of full image process control (b) after implementation of full image process control (courtesy of FUR Systems, Inc.)-...

To implement Ml image process control, an IR line scanner is placed at the oven exit, scaiming across each blank as it leaves the oven. The forward movement of the part, combined with the fast response of the line scanner, provides the Ml thermal map to the computer. A Ml statistical control chart is software-generated, based on mean temperature and standard deviation over the entire surface. The oven heater is zoned and the computer interfaced to a relay control board with one relay managing a set-point controller for each zone. The statistics for each control zone are calculated based on the corresponding section on the part, and a closed-loop statistical process control algorithm is implemented. The result is seen on the 3D strip map presentation shown in Fig. 10.8(b). The color hues indicate temperatures in accordance with the scale at the left. The control level temperature is about 300°F. 

Raytek (Fluke) CS-100, GS-lOO, TF-100, TIP-450 (all using the MP-50 Thermalert line scanner) Optomechanically scanned each system for a different process application, modular thermoelectrically cooled, high-resolution analog and digital outputs various wavelengths operate with integral control system or host computer. 

Apparent temperature - The target surface temperature indicated by an infrared point sensor, line scanner or imager. 

Scan angle - For a line scanner, the total angular scan possible at the target plane, typically 90°. 

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