The requirements placed on medical diagnostic systems are steadily increasing: They need to be precise, portable and as non-invasive as possible. For engineers, this means smarter use of optical sensing. Spectral sensors, particularly those detecting both visible and near-infrared light, are emerging as key components in this regard. One example is the TCS3448 from ams OSRAM, which is used in applications ranging from skin analysis to microfluidic diagnostic systems.
Capabilities of spectral sensors
Unlike conventional color sensors that measure only broad red, green and blue channels, spectral sensors such as the TCS3448 deliver finely resolved, multi-channel data. They capture light intensity across multiple defined wavelength ranges. This enables more precise characterization of materials, biological tissues and fluids based on their specific spectral signatures.
In medical technology, this allows contactless, real-time analysis, such as assessing skin changes (e.g., melanoma evaluation) or analyzing test strips in point-of-care diagnostic systems. Invasive procedures are thus minimized, making diagnostics more mobile and patient centered.
Integration and technical features
The TCS3448 is a 14-channel spectral sensor, covering the range from 380 to 1,000 nm. In addition to eleven channels centered in the visible spectrum, a NIR channel, a clear channel and a flicker detection channel are also available. The latter detects interference from artificial lighting up to 2 kHz, which is crucial for reproducible diagnostics. Integrated 16-bit ADCs, along with configurable integration times and gain ratios, allow flexible adaptation to various measurement environments.
With a typical power consumption of 280 µA in active mode and 5 µA in sleep mode, the sensor is especially suited for battery-operated systems. The compact OLGA-8 package (3.1 × 2.0 × 1.0 mm) facilitates integration even in space-constrained designs. Thanks to high-precision interference filters directly deposited on photodiodes, which are embedded in CMOS silicon, no additional optics are required, which reduces the size and increases measurement accuracy. For use in medical technology, compliance with regulatory standards (e.g., ISO 13485, CE or FDA) is essential, facilitated by standardized, non-invasive measurement methods.
Applications ranging from skin diagnostics to pharmaceuticals
These features open up a broad range of applications in medical technology. Spectral sensors deliver objective and reproducible data, for example in skin diagnostics, microfluidic testing or in laboratory and pharmaceutical applications. Furthermore, they can be integrated into compact, mobile systems.
Skin conditions like neurodermatitis or psoriasis often involve redness (erythema) and pigment alterations. However, these signs are difficult to assess subjectively and vary greatly. A spectral sensor such as the TCS3448 enables the objective measurement of erythema and pigment values, documentation of their progression and tracking of therapy effects. This is especially valuable in telemedicine or home monitoring applications, as it provides reproducible data for digital patient records or apps.
In lab-on-a-chip systems or rapid tests for infectious diseases, a color change indicates the presence of an analyte. However, especially at low concentrations or under varying light conditions, the human eye quickly reaches its limits. The TCS3448 detects the smallest color changes with high spectral resolution, making it ideal for portable, battery-efficient diagnostic systems. This approach also enables more reliable evaluation of multiplex assays with overlapping color signals.
In the pharmaceutical industry and laboratory technology, color is a critical quality criterion. Deviations may indicate contamination, degradation or incorrect formulations. The TCS3448 enables reliable and automatable color control, e.g., for tablets, reagents or culture media. It also provides robust and objective measurement data for digital pathology and laboratory automation.
In addition to color analysis, the sensor also captures parts of the near-infrared range, allowing straightforward fluorescence measurements. This capability is increasingly important for compact point-of-care devices, such as those for testing malaria, HIV or iron deficiency. Its low energy consumption and compact design further support use in portable diagnostic devices.
Smart diagnostics with optical signatures
As wearables and AI-supported diagnostics become more widespread, optical sensor signals are growing in importance. The quality of the input data is crucial in this context: The TCS3448 provides spectrally resolved information across multiple wavelength ranges, which can be fed into machine learning models with minimal preprocessing. This enables detection of patterns in tissues, fluids or surfaces that are invisible to the human eye.
Potential applications include smart skin patches for measuring hydration or oxygen saturation, compact home care devices and smartphone accessories for mobile health checks. Comprehensive health profiles can be generated, particularly when combined with other sensor data, such as temperature. In combination with cloud connectivity and AI algorithms, this opens up new avenues in personalized medicine – for example through continuous, non-invasive monitoring in daily life. Spectral sensors can also support digital pathology or automated laboratory processes in clinical settings by supplying reproducible, objective data for diagnosis and therapy.
Summary
Spectral sensors such as the TCS3448 enable developers to create modern, portable diagnostic systems that are contact free, data driven and compact. Whether in skin analysis, microfluidic test systems or pharmaceutical quality assurance: They deliver precise data with minimal integration effort, forming a key foundation for the next generation of smart diagnostic systems.
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