Published July 4, 2026 at 11:56
All standard microscopes image using visible light in the 400–700 nm range. This is also the light perceived by the human eye, which is practical: the microscope shows exactly what the eye would see if it were powerful enough. However, visible light reflects off the surface of all materials—it does not penetrate coatings, silicone, tape, or the upper layers of the skin. For applications where you need to see beneath the surface, a different light is required. Near-infrared (NIR) at 850 nm is the standardized wavelength that offers the optimal compromise between penetration depth, sensor sensitivity, and practical handling.
What the AM4517M-FIT Is
Dino-Lite EDGE PLUS AM4517M-FIT is a compact USB microscope featuring:
- 850 nm IR LED illumination with 32 intensity levels—the entire illumination is NIR, with no visible light.
- High-sensitivity CMOS sensor—designed to capture the NIR signal that visible-light sensors normally filter out.
- 10× to 220× magnification—covers everything from overview imaging to detailed analysis.
- 1.3 megapixels (1280×960) at 30 fps—smooth video feed suitable for dynamic observation.
- Automatic Magnification Reading (AMR)—the magnification level is read digitally so the measurement function is always correctly calibrated.
- Robust metal housing—anodized aluminum with EMI shielding for industrial environments.
The Physics—Why 850 nm Penetrates Where Visible Light Stops
When light hits a material, three things happen: reflection, absorption, and transmission. The proportion that is absorbed or transmitted is strongly wavelength-dependent:
- Blue light (450 nm)—Heavily absorbed by most paints, adhesives, and biological materials. Penetration in tissue: a fraction of a millimeter.
- Green light (550 nm)—Absorbed by hemoglobin (red blood) but transmitted through certain plastics. Penetration in tissue: 1–2 mm.
- Red light (650 nm)—Minimally absorbed by water and most biological pigments. Penetration in tissue: 3–5 mm.
- Near-infrared 850 nm—Minimally absorbed by water, with no absorption in melanin or most color pigments. Penetration in tissue: 5–10 mm.
For opaque industrial materials (black coatings, silicone encapsulations, tape adhesives), NIR transmission is often 20 to 50 times higher than that of visible light. This means you can see structures beneath a layer of paint or silicone sealant that are completely invisible in visible light.
Sensor Sensitivity—Why Standard Sensors Do Not Work
Conventional CMOS sensors are designed for visible light and feature an IR-cut filter in front of the sensor to block NIR—otherwise, a sunny outdoor image would appear reddish due to infrared background light. The AM4517M-FIT is instead built with an IR-optimized sensor without a cut filter—the sensor’s quantum efficiency at 850 nm is at a level comparable to that of visible-light sensors at 550 nm.
This is a technical distinction not always highlighted on spec sheets, but it is critical in practice: with the right sensor, you get a clear image under NIR illumination even at low light levels; with the wrong sensor, the image remains dark and noisy even at full LED intensity.
32 Intensity Levels—Why So Many?
NIR inspection is sensitive to over- and underexposure in a way visible light is not. Overexposed (”blown out”) areas lose all information regarding subsurface structures. Underexposed areas result in a noisy image.
With 32 intensity levels, the operator can adjust the illumination step-by-step until the image is in the optimal exposure zone. This is especially important for:
- PCB inspection where different materials on the same board absorb NIR differently (green solder mask vs. copper traces vs. plastic components).
- Skin analysis where different skin tones exhibit varying NIR absorption.
- Artwork authentication where the thickness of varnish layers varies across the painting.
Automatic Magnification Reading (AMR)
The microscope can be used across a 10–220× magnification range. For the measurement function to deliver accurate absolute dimensions (e.g., ”this crack is 0.15 mm wide”), the software must know the exact magnification used for each measurement.
The AMR function reads the magnification level electronically from the position of the focus ring and transmits the value directly to the DinoCapture software. The operator never needs to update the magnification value manually—it updates automatically with every adjustment. Measurement values therefore remain accurate regardless of how many times the magnification is adjusted during a session.
Where the AM4517M-FIT Makes a Real Difference
Printed Circuit Board (PCB) inspection: NIR penetrates green solder mask and reveals traces, cracks, and vias beneath the mask without requiring its removal. Critical for QC of manufactured boards and failure analysis of returned products.
Silicone-encapsulated electronic components: Many LED and sensor components are encapsulated in silicone. NIR looks through the silicone into the chip interior to verify bond wire positions.
Dermatological skin analysis: Melanin, collagen, and vascular structures in the skin are clearly visible in NIR. A standard tool in modern dermatology clinics.
Artwork authentication and restoration: NIR imaging reveals underdrawings, sketches beneath varnish layers, and the extent of previous restorations on oil paintings.
Forensic documentation: Concealed writing, altered documents, faded tattoos, and other ”invisible” traces are revealed under NIR.
Textile manufacturing: Fiber analysis and colorfastness testing where NIR reading evaluates dye absorption independently from visual reflection.
Banknote and document examination: Many security features in banknotes and passports are NIR-fluorescent or NIR-absorbent. A standard tool for anti-counterfeiting.
Food analysis: Fat, protein, and water content can be measured via NIR absorption. Combined with microscopy: structural analysis of meat, dairy products, and baked goods.
Semiconductor manufacturing: Silicon is transparent in NIR above 1100 nm, but even at 850 nm it provides increased penetration compared to visible light. Useful for wafer inspection and chip failure analysis.
Botany and biology: Leaf structures, chlorophyll content, and vascular systems are clearly visible in NIR—the foundation for vegetation index analysis.
What You Get for Your Investment
Dino-Lite EDGE PLUS AM4517M-FIT, 1.3 Mpixels CMOS sensor optimized for NIR (without IR-cut filter), 850 nm IR LED illumination with 32 intensity levels, 10–220× magnification, Automatic Magnification Reading (AMR), measurement capabilities via DinoCapture, USB 2.0 interface, robust anodized aluminum housing with EMI shielding, compatible with standard Dino-Lite stands.
7,469 SEK is the instrument investment. For a clinic, electronics workshop, or forensic laboratory requiring NIR visualization, this is in an entirely different price range compared to traditional NIR systems (which typically range from 25,000 to 100,000 SEK). The DinoCapture software is included free of charge. Stands and accessories (polarizer, hollow-light adapter) are sold separately.
Read more: Dino-Lite EDGE PLUS AM4517M-FIT IR 850 nm in the store →
