INDUSTRY COMPONENT

Photosensitive Element

A photosensitive element is an optoelectronic component that converts light signals into electrical signals, used in photometric sensors for industrial measurement and control applications.

Component Specifications

Definition
A photosensitive element is a semiconductor-based optoelectronic device designed to detect and respond to specific wavelengths of light by generating an electrical signal proportional to light intensity. In photometric sensors, it serves as the primary sensing component that enables non-contact measurement of light properties such as intensity, color, or spectral distribution. These elements are engineered with precise spectral sensitivity characteristics and response times to meet industrial measurement requirements.
Working Principle
The working principle is based on the photoelectric effect, where incident photons with sufficient energy strike the semiconductor material, creating electron-hole pairs. This generates a photocurrent or changes the electrical resistance/voltage of the material. In photodiodes, reverse-biased p-n junctions collect these charge carriers, producing a current proportional to light intensity. In phototransistors, the photocurrent is amplified internally. The element's output signal is then processed by accompanying electronics to provide measurable data about the light source being analyzed.
Materials
Typically silicon (Si) for visible to near-infrared range (400-1100 nm), germanium (Ge) for infrared applications, or compound semiconductors like gallium arsenide (GaAs) for specific wavelength requirements. Encapsulation materials include epoxy resins, glass, or ceramic packages with optical windows. Electrodes are usually gold-plated or aluminum for reliable electrical connections.
Technical Parameters
  • Linearity ±1% over specified range
  • Active Area 0.1-100 mm²
  • Sensitivity 0.1-10 μW/cm² minimum detectable
  • Dark Current 1-100 nA at 25°C
  • Responsivity 0.5-0.7 A/W at peak wavelength
  • Response Time 1-100 ns
  • Spectral Range 400-1100 nm (typical silicon)
  • Operating Temperature -40°C to +85°C
Standards
ISO 10110-8, ISO 13694, DIN 5032, DIN 5036

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Photosensitive Element.

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Contamination of optical surfaces reducing sensitivity
  • Thermal drift affecting measurement accuracy
  • Overexposure to intense light causing permanent damage
  • Electrostatic discharge during handling
  • Moisture ingress in non-hermetic packages
FMEA Triads
Trigger: Contamination on optical surface
Failure: Reduced light transmission and measurement inaccuracy
Mitigation: Regular cleaning protocols, protective covers when not in use, cleanroom handling procedures
Trigger: Thermal expansion mismatch in packaging
Failure: Cracking of encapsulation or detachment of electrical connections
Mitigation: Use of compatible CTE materials, proper thermal management design, temperature cycling testing
Trigger: Electrostatic discharge during installation
Failure: Permanent damage to semiconductor junction, increased dark current
Mitigation: ESD-protected workstations, proper grounding procedures, antistatic packaging and handling

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±5% responsivity variation across production batches, ±2% spectral response consistency
Test Method
Calibrated light source measurement at multiple wavelengths, dark current measurement at specified temperatures, response time testing with pulsed light sources

Buyer Feedback

★★★★☆ 4.8 / 5.0 (8 reviews)

"Reliable performance in harsh Computer, Electronic and Optical Product Manufacturing environments. No issues with the Photosensitive Element so far."

"Testing the Photosensitive Element now; the technical reliability results are within 1% of the laboratory datasheet."

"Impressive build quality. Especially the technical reliability is very stable during long-term operation."

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Frequently Asked Questions

What is the difference between a photosensitive element and a complete photometric sensor?

A photosensitive element is the core component that converts light to electrical signals, while a photometric sensor includes additional electronics for signal processing, amplification, and output interfaces. The element alone requires supporting circuitry to function as a complete measurement system.

How do I select the right photosensitive element for my application?

Consider spectral range matching your light source, required sensitivity and response time, active area size, operating temperature range, and package type. Silicon elements work for most visible applications, while specialized materials are needed for UV or IR detection.

What maintenance do photosensitive elements require?

Regular cleaning of optical surfaces, protection from excessive light exposure when not in use, monitoring of temperature effects on performance, and periodic calibration against known light sources to maintain measurement accuracy.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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