Optical Sensors - Reflective

Optical Sensors - Reflective - Analog Output

Image	Part Number	Description / PDF	Quantity	Rfq
	LTH-1550-01 Lite-On, Inc.	PHOTOINTERRUPTER REFL 940/PTR	0
	LTH-301-19 Lite-On, Inc.	PHOTOINTERRUPTER SWITCH PTR SLOT	0
	LTH-209-01 Lite-On, Inc.	PHOTOINTERRUPTER REFL 940/PTR	0
	HEDS-1500 Lite-On, Inc.	INTERRUPTER REFLECT 8-PIN TO-5	0
	LTH-1650-01 Lite-On, Inc.	PHOTOINTERRUPTER REFL 940/PTR	0
	LTH-301-23 Lite-On, Inc.	PHOTOINTERRUPTER SWITCH PTR SLOT	0
	HBCS-1100 Lite-On, Inc.	PHOTOSENSOR REFLECT 700NM 8P TO5	0
	LTH-301-27P1 Lite-On, Inc.	PHOTOINTERRUPTER SWITCH PTR SLOT	0
	LTH-1550-06 Lite-On, Inc.	PHOTOINTERRUPTER REFL 940/PTR	0

Optical Sensors - Reflective - Analog Output

1. Overview

Reflective optical sensors with analog output are optoelectronic devices that detect the presence, distance, or reflectivity of objects by emitting light and measuring the intensity of reflected light. Unlike digital sensors, analog output sensors provide continuous voltage/current signals proportional to the detected light intensity, enabling precise measurement of position, color, or material properties. They play critical roles in automation, robotics, and precision measurement systems where real-time analog data is required.

2. Main Types and Functional Classification

Type	Functional Features	Application Examples
Infrared Reflective Sensors	Use IR LEDs (850-950nm), insensitive to ambient light	Industrial object detection, paper jam sensors in printers
Visible Light Sensors	Use green/red LEDs, sensitive to surface color variations	Color recognition in packaging, liquid level monitoring
High-Precision Analog Sensors	0-5V/4-20mA outputs with 0.5% linearity	Semiconductor wafer alignment, precision displacement measurement

3. Structure and Components

Typical components include: - Light Source: GaAlAs LED (5-50mA forward current) - Receiver: PIN photodiode with built-in amplifier - Optical System: Collimating lens ( 2 beam angle) - Signal Processor: Transimpedance amplifier with temperature compensation - Enclosure: IP67-rated housing with anti-reflective coating

4. Key Technical Specifications

Parameter	Importance
Operating Distance	0.1-500mm range affects application flexibility
Resolution	Up to 0.01mm for precision measurement
Output Linearity	0.2% FS ensures accurate signal representation
Response Time	10 s-1ms for high-speed processes
Ambient Light Immunity	10,000 lux tolerance prevents false triggering

5. Application Areas

Industrial Automation: Conveyor belt object detection, robotic arm positioning
Medical Devices: Blood glucose meter test strip recognition
Consumer Electronics: Smartphone proximity sensing with adaptive brightness
Automotive: Rain sensor for windshield wipers (water film thickness measurement)

6. Leading Manufacturers and Products

Manufacturer	Product	Key Features
Omron	E3Z-LS61	0.1mm resolution, 0-10V output, IP69K rating
ON Semiconductor	APDS-9960	RGB-IR sensing, 12-bit ADC, I2C interface
Texas Instruments	OPT3101	Time-of-Flight sensing, 16-bit resolution

7. Selection Guidelines

Determine required detection range and resolution
Match output type (voltage/current) with control system
Consider environmental factors (temperature, vibration)
Evaluate optical window material for chemical resistance
Check compliance with industry standards (IEC 60947-5-2)

8. Industry Trends

Emerging trends include: - Integration of AI-based signal processing for adaptive thresholding - Development of UV/VIS multispectral sensors for material analysis - Miniaturization to enable embedded applications (sub-1mm packages) - Wireless-enabled sensors with IO-Link compatibility - Increased adoption of MEMS-based tunable optical filters