Optical Sensors & Detector – UV Photodetectors
Visible Photodetector TOCON_SI1
TOCON_SI1 – Ultra-Sensitive Visible Photodetector for Low-Light Measurement and Optical Calibration Applications
The TOCON_SI1 from SGLUX GmbH is an ultra-sensitive visible-light photodetector designed for precise radiometric and photometric measurements even at very low illumination levels.
It integrates a high-quality silicon photodiode with a high-gain, low-noise transimpedance amplifier inside a compact TOCON housing, producing a 0–5 V analog output directly proportional to light intensity.
Engineered for the 400–700 nm visible spectrum, the TOCON_SI1 ensures excellent linearity and signal stability, making it ideal for low-intensity light calibration, optical testing, display evaluation, and LED analysis.
Each sensor is factory-calibrated and traceable to NIST / PTB standards, guaranteeing accuracy, reproducibility, and long-term reliability.
Its compact, rugged design and maintenance-free operation make the TOCON_SI1 a reliable solution for laboratory photometry, scientific research, and precision illumination monitoring.
Understanding Visible Photodetector TOCON_SI1
The TOCON_SI1 is a high-gain visible-light photodetector optimised for low-light intensity measurements across the 400–700 nm range.
It combines a silicon photodiode with an integrated transimpedance amplifier, delivering a linear 0–5 V DC signal without external circuitry.
Thanks to its enhanced sensitivity and low noise, it captures small variations in visible irradiance, ideal for optical calibration, LED characterisation, and display brightness analysis.
Factory-calibrated for traceable accuracy, the TOCON_SI1 ensures reproducible results for scientific and industrial light-measurement systems, where high precision and low-light detection are critical.
Technical Specifications
| Feature | Specification |
|---|---|
| Function | Ultra-sensitive visible-light photodetector with integrated amplifier |
| Detector Type | Silicon photodiode with high-gain transimpedance amplifier |
| Spectral Range | 400 – 700 nm (visible spectrum) |
| Peak Wavelength | ~550 nm |
| Output Signal | 0 – 5 V DC (linear with irradiance) |
| Sensitivity | Very high – optimised for low-light levels |
| Accuracy | ±5 % of reading |
| Response Time | < 1 s |
| Saturation Irradiance | Approx. 1 mW/cm² |
| Operating Voltage | 5 – 24 V DC |
| Operating Temperature | −20 … +85 °C |
| Housing Material | Anodised aluminium, TOCON standard enclosure |
| Optical Window | Borosilicate / optical glass |
| Connector | BNC / M8 / custom cable output |
| Calibration | Factory-calibrated, traceable to NIST / PTB |
| Compatibility | SENSOR MONITOR 5.0 / VOLTCON / SGCD4 systems |
| Applications | Low-light photometry, optical calibration, display testing, LED research, illumination monitoring |
Key Features and Advantages
Ultra-High Sensitivity for Low-Light Measurement
The TOCON_SI1 is designed for applications where light intensity is extremely low, such as optical calibration, darkroom monitoring, or display testing.
Integrated High-Gain Amplifier
Its internal transimpedance amplifier converts photocurrent to voltage, providing a ready-to-use 0–5 V output proportional to irradiance.
Accurate Across the Visible Spectrum
Covers the full 400–700 nm visible range with peak response near 550 nm, aligning closely with human eye sensitivity.
Traceable Calibration
Each device is NIST / PTB calibrated, ensuring repeatable, traceable measurements suitable for research and regulatory documentation.
Low Noise and Fast Response
Delivers stable readings and sub-second response times, making it ideal for real-time monitoring in low-light conditions.
Compact and Durable Design
Encased in a rugged aluminium housing, ensuring long-term reliability in laboratory and industrial environments.
Maintenance-Free Operation
Solid-state construction eliminates drift and recalibration needs, ensuring consistent accuracy over time.
Flexible System Integration
Compatible with SENSOR MONITOR 5.0, VOLTCON, and SGCD4, making integration with measurement systems fast and reliable.
The TOCON_SI1 delivers high-gain, low-noise performance, making it the perfect sensor for sensitive optical measurements, illumination testing, and precision calibration in scientific and industrial settings.
Applications Across Industries
Optical Calibration and Testing
Ensures precise radiometric calibration of light sources and optical instruments under controlled illumination.
Display and Monitor Evaluation
Measures screen brightness, luminance uniformity, and colour rendering under low-intensity lighting.
LED and Laser Characterisation
Accurately detects visible-light emissions from low-power LEDs and solid-state lighting devices.
Photometric and Research Laboratories
Used for traceable light measurements in research on vision science, materials, and photometry.
Environmental and Architectural Lighting
Monitors ambient light levels for energy-efficient lighting control and environmental analysis.
Precision Manufacturing and Inspection Systems
Supports machine-vision and inspection lighting applications requiring precise visible intensity data.
The TOCON_SI1 offers traceable calibration, high-gain sensitivity, and stability, making it indispensable for low-light optical metrology, photometric calibration, and scientific illumination studies.
Why Choose United Spectrum Instruments?
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Exclusive distributor of SGLUX TOCON_SI1 in India
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Expertise in visible-light measurement and photometric calibration systems
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Local calibration traceable to NIST / PTB standards
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Competitive solutions for OEMs, laboratories, and R&D facilities
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Pan-India technical, integration, and service support
FAQs
What does the TOCON_SI1 measure?
It measures visible-light irradiance (400–700 nm), ideal for low-intensity light applications.
Is it factory-calibrated?
Yes – every sensor is factory-calibrated and traceable to NIST / PTB standards.
Does it require an external amplifier?
No – it has a built-in high-gain amplifier for direct 0–5 V output.
Can it detect LED or low-level light sources?
Yes – it’s optimised for low-light and LED photometric applications.
How does United Spectrum support Indian users?
By offering integration, calibration, and after-sales support for optical and photometric measurement systems.
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FAQs
What does the TOCON_SI1 measure?
It measures visible-light irradiance (400–700 nm), ideal for low-intensity light applications.
Is it factory-calibrated?
Yes – every sensor is factory-calibrated and traceable to NIST / PTB standards.
Does it require an external amplifier?
No – it has a built-in high-gain amplifier for direct 0–5 V output.
Can it detect LED or low-level light sources?
Yes – it’s optimised for low-light and LED photometric applications.
How does United Spectrum support Indian users?
By offering integration, calibration, and after-sales support for optical and photometric measurement systems.
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