10. Application suitability: The required optical resolution depends on the specific application. For example, building inspections might need lower resolution than military targeting systems.

Optical resolution is often measured using the Rayleigh criterion, which defines the minimum distance between two point sources that can be resolved as separate entities. In practice, test patterns with line pairs of known spacing are used. For digital systems, resolution can be measured up to the Nyquist frequency, which is related to pixel size. The limit of resolution depends on the wavelength and numerical aperture.

At Process Parameters, we’re a UK distributor of Optris thermal cameras. Contact our team to discuss your application and find out how thermal imaging can improve your process.

However, if you need to zoom in and see finer details on smaller objects, a higher optical resolution with a narrower field of view would be preferable.

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If you have any questions or need help finding the right IR camera for your application, please get in touch. Complete our online enquiry form, email sales@processparameters.co.uk or call 01628 778788.

Optical resolution refers to the ability of an imaging system to distinguish and capture fine details in an object or scene. It’s a measure of how clearly a camera, microscope, or other optical device can resolve small, closely spaced features as distinct and separate elements in the final image.

Optical resolution refers to the ability of an optical system (like a microscope) to distinguish between separate entities, based on factors like wavelength, numerical aperture, and diffraction patterns. Spatial resolution, often used in digital imaging, relates to the smallest discernible detail in an image, typically determined by pixel size. While related, optical resolution is fundamentally limited by physics, while spatial resolution can be influenced by the camera system’s specifications.

1. Image detail: Higher optical resolution allows thermal cameras to capture finer details and smaller temperature differences in a scene. This is crucial for detecting subtle heat patterns or small heat sources.

For almost all applications in the industry, resolutions between 160 x 120 and 640 x 480 pixels (pin-sharp VGA resolution) are totally sufficient. Today, compact infrared cameras are best suited to quick online applications in the analysis of dynamic thermal processes.

4. Spatial resolution: This determines the smallest detectable object at a given distance. Higher optical resolution improves spatial resolution, allowing the camera to distinguish between closely spaced heat sources.

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Optical resolution plays a big role in how clear our images turn out, and getting to grips with it is key if we want pictures that are both accurate and sharp.

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9. Data processing requirements: Higher-resolution thermal images contain more data, which may require more powerful processing capabilities for real-time analysis.

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Thermal cameras offer a unique perspective, revealing the world through the lens of heat. But within this technology lies a crucial concept: optical resolution.

Therefore, E:M (Distance from object to device) : (Diameter of measuring spot) represents the ratio that determines the optical resolution of the thermal camera. A higher ratio (larger object distance compared to the measuring spot size) signifies better optical resolution, allowing for capturing finer details and temperature variations.

2. Measurement accuracy: Better optical resolution enables more precise temperature measurements, especially for small or distant objects. It reduces the risk of averaging temperatures across larger areas.

Understanding optical resolution is essential for selecting appropriate imaging equipment for specific tasks and interpreting the resulting images accurately.

At Process Parameters, we supply Optris thermal cameras and infrared thermometers which are renowned for their next-level thermography. From high-temperature thermometers to industrial thermal cameras for condition monitoring and early fire detection, we can help.

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Higher optical sensor resolution can be better, but it’s not the only important factor. In optical microscopy, a higher resolution allows for distinguishing smaller separate entities. However, factors like numerical aperture, wavelength, and diffraction also play crucial roles. The resolving power of a microscope depends on these elements, not just pixel size in digital systems.

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Process Parameters Ltd, established in 2004, is a UK based manufacturer and supplier of industrial temperature sensors including thermocouples, platinum resistance thermometers, (also known as RTDs and Pt100), thermistor sensors, infrared sensors, thermal imaging cameras, data loggers and transmitters.

Thermal imaging cameras, just like normal digital cameras, are using a field of view (FOV) which can cover angles of 6° for a tele lens, 26° for a standard lens and up to 90° for a wide-angle lens. The further you get from the object, the larger the captured image region, and with it, the image detail that an individual pixel can capture.

8. Cost and complexity: Higher-resolution thermal imaging systems typically require more sophisticated optics and sensors, which can increase cost and complexity.

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Optical resolution refers to the finest detail an imaging system can capture. Imagine it as the sharpness of your vision. It depends on the quality of lenses, detectors, and even the environment. Higher resolution means capturing more image details. Think of a high-resolution camera capturing individual hairs on someone’s head, while a low-resolution camera might only show a blurry figure.

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To increase optical resolution, consider using shorter wavelengths (like ultraviolet light instead of visible light) or increasing the numerical aperture of the objective lens. Improving the refractive index of the medium between the lens and specimen can help. In digital systems, reducing pixel size can increase resolution, but only up to the diffraction limit set by the optical system’s properties.

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Choosing the right optical resolution involves balancing these benefits against factors like cost, processing requirements, and specific application needs.

In technical terms, optical resolution is often expressed as a ratio or in dots per inch (dpi) for scanners and digital cameras. For optical instruments like microscopes or telescopes, it might be expressed in terms of angular resolution or spatial resolution.

Questions? Speak to one of our experts about your temperature measurement requirements. Our engineers can work with you to develop and manufacture custom designs of temperature sensors.

Choosing the right thermal camera depends on your requirements. If you need to see a large area and identify general heat sources, a wider field of view with a lower resolution might suffice.

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7. Field of view (FOV): While not directly related to resolution, the optical system’s design affects both resolution and FOV. Higher resolution systems often allow for a wider FOV without sacrificing detail.

5. Image quality: Higher resolution generally results in clearer, sharper thermal images, making interpretation easier and more accurate.

3. Detection range: Improved optical resolution allows thermal cameras to detect and identify heat sources from greater distances, which is particularly important in surveillance and industrial applications.

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In the context of optical resolution (E:M), the “E” and “M” represent two specific distances in the measurement system, not a general term. Here’s the breakdown:

6. Minimum resolvable temperature difference (MRTD): This is the smallest temperature difference the camera can detect. Better optical resolution often correlates with improved MRTD.

Thermal cameras with high optical resolution offer industries enhanced defect detection, precise temperature measurement, and improved safety monitoring. They enable detailed analysis in applications like predictive maintenance, condition monitoring, quality control, and energy auditing across various sectors.