Light Source/Detector for Encoders and Resolvers | Industrial Feedback Components

Product Specifications

Technical details and manufacturing context for Light Source/Detector

Definition

The Light Source/Detector is a combined optical component used within feedback devices such as encoders and resolvers. It integrates a light-emitting element, typically an LED or laser diode, with a light-sensitive detector, such as a photodiode or phototransistor array. This component generates a light beam that interacts with a coded disk or strip, and the detector receives the modulated light pattern, converting it into electrical signals for precise measurement of rotational position, speed, or linear displacement. The device is designed for industrial machinery and equipment manufacturing, where accurate feedback is critical for motion control and automation. Key specifications include a wavelength range of 650–980 nm, output power of 1–10 mW, supply voltage of 5–24 V DC, current consumption of 20–50 mA, response time of 1–10 μs, operating temperature of -20 to 70 °C, storage temperature of -40 to 85 °C, humidity range of 5–95% RH (non-condensing), IP rating of IP54–IP67 per IEC 60529, detection distance of 0.1–10 m, resolution of 0.01–0.1 mm, output types NPN/PNP, connection options M8/M12, and weight of 50–200 g. Materials include gallium arsenide (GaAs) for LEDs, silicon for photodiodes, and optical-grade plastics or glass. These values are typical ranges for industrial applications and must be verified against the specific model and application requirements with the legal manufacturer or supplier. The component's performance depends on factors such as reflector quality, ambient light, and environmental conditions. Proper selection requires consideration of electrical interfaces, mechanical mounting, and environmental sealing. Regular maintenance includes cleaning optical surfaces and checking for signal integrity. Failures may manifest as erratic signals or complete loss of output, often due to contamination, component aging, or electrical issues. Always consult the manufacturer's documentation for detailed specifications and installation guidelines.

Working Principle

The light source emits a beam, typically from an LED or laser diode, which is directed onto a coded disk or strip. The disk or strip has patterns that modulate the light. The detector, consisting of photodiodes or phototransistors, receives the reflected or interrupted light and converts the optical pattern into electrical signals. These signals are processed to determine position, speed, or displacement. The interaction between the light and the coded pattern is fundamental to the measurement accuracy.

Common Materials

Gallium Arsenide (GaAs) for LEDs, Silicon for photodiodes, Optical-grade plastics/glass

Technical Parameters

Parameter	Typical range	Notes & selection driver
Wavelength	650–980 nm	Determines compatibility with fiber and detector sensitivity
Output Power	1–10 mW	Higher power for longer sensing distances
Supply Voltage	5–24 V DC	Typical industrial voltages
Current Consumption	20–50 mA	Affects power budget
Response Time	1–10 μs	Faster for high-speed counting
Operating Temperature	-20–70 °C	Extended range for harsh environments
Storage Temperature	-40–85 °C	Non-operating limits
Humidity	5–95 % RH	Non-condensing
IP Rating	IP54–IP67	Higher for dusty/wet environmentsIEC 60529
Detection Distance	0.1–10 m	Depends on reflector and ambient light
Resolution	0.01–0.1 mm	For position sensing accuracy
Output Type	NPN/PNP	Compatibility with PLC inputs
Connection	M8/M12	Common industrial connectors
Weight	50–200 g	Affects mounting considerations

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

LED/Laser Diode Part
Generates coherent/incoherent light beam for position encoding

Material: Gallium Arsenide (GaAs) or similar semiconductor
Photodiode Array
Detects light intensity variations and converts to electrical signals

Material: Silicon or Germanium
Optical Lens Part
Focuses and directs light beam between source and detector

Material: Optical glass or acrylic
Housing Part
Protects optical components and ensures alignment

Material: Engineering plastic or aluminum

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Feedback Device (Encoder/Resolver)

View system integration details

Manufacturers of Light Source/Detector

Manufacturer profiles associated with Light Source/Detector.

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Frequently Asked Questions

What is the typical wavelength range for this component?

The wavelength range is 650–980 nm, which affects compatibility with fiber optics and detector sensitivity. Confirm the exact wavelength for your application with the manufacturer.

What output types are available?

The output types are NPN and PNP, which are compatible with PLC inputs. Choose based on your control system's requirements.

What is the operating temperature range?

The operating temperature range is -20 to 70 °C, with storage temperature from -40 to 85 °C. Ensure the environment stays within these limits for reliable operation.

How does the IP rating affect usage?

The IP rating ranges from IP54 to IP67 per IEC 60529, indicating protection against dust and water. Higher ratings are suitable for dusty or wet environments. Verify the specific rating for your model.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	0 to 2 bar absolute
other spec:	Max particulate concentration: 5% w/v, Max flow velocity: 3 m/s
temperature:	-20°C to +85°C

Light Source/Detector

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards