Interferometric Optical Head for Precision Surface Measurement

Product Specifications

Technical details and manufacturing context for Interferometric Optical Head

Definition

The interferometric optical head is a critical component within the Precision Optical Lens Inspection and Measurement System. It functions as the primary sensing unit, projecting coherent light onto the lens surface and capturing the resulting interference fringes. These fringes are used to calculate surface topography, curvature, and defects with nanometer-level accuracy, enabling high-precision quality control in optical manufacturing. The head emits a coherent light beam, typically from a HeNe laser with a wavelength of 632.8 nm, which is split into a reference beam and a measurement beam. The measurement beam reflects off the optical lens surface, while the reference beam travels a known path. The two beams recombine, creating an interference pattern whose phase and intensity variations correspond directly to the surface profile of the lens under test. This pattern is captured by a detector array and processed to generate 3D surface maps. The head is designed for integration into inspection systems, with a measurement range of 0.1–10 mm depending on surface reflectivity, and a sub-nanometer vertical resolution of 0.1 nm. Accuracy is ±0.5 nm, traceable to a wavelength standard. Working distance ranges from 10–50 mm, and numerical aperture from 0.5–0.95, with higher NA providing higher lateral resolution. The head operates in temperatures from 15–35 °C and can be stored from -10–50 °C, with non-condensing relative humidity of 20–80%. It requires a universal power supply of 100–240 V AC and consumes 15–30 W. The head assembly weighs 1.5–2.5 kg and is protected to IP54 per IEC 60529. Materials include fused silica, stainless steel, and precision bearings. All specifications are reference values; verify model-specific data with the manufacturer.

Working Principle

The head emits a coherent light beam (typically from a laser) that splits into a reference beam and a measurement beam. The measurement beam reflects off the optical lens surface, while the reference beam travels a known path. The two beams recombine, creating an interference pattern whose phase and intensity variations correspond directly to the surface profile of the lens under test. This pattern is captured by a detector array and processed to generate 3D surface maps.

Common Materials

Fused Silica, Stainless Steel, Precision Bearings

Technical Parameters

Parameter	Typical range	Notes & selection driver
Wavelength	632.8 nm	HeNe laser standard
Output Power	0.5–1.0 mW	Class 2 laser product
Measurement Range	0.1–10 mm	Depending on surface reflectivity
Resolution	0.1 nm	Sub-nanometer vertical resolution
Accuracy	±0.5 nm	Traceable to wavelength standard
Working Distance	10–50 mm	Objective lens dependent
Numerical Aperture	0.5–0.95	Higher NA for higher lateral resolution
Operating Temperature	15–35 °C	Stable temperature required for accuracy
Storage Temperature	-10–50 °C	Avoid extreme temperature changes
Relative Humidity	20–80 % RH	Non-condensing
Input Voltage	100–240 V AC	Universal power supply
Power Consumption	15–30 W	Includes electronics
Weight	1.5–2.5 kg	Head assembly only
Protection Class	IP54	Dust and splash water protectedIEC 60529

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

Laser Source
Generates coherent monochromatic light for interference

Material: Semiconductor/Gas Laser Components
Beam Splitter
Divides the incoming light into reference and measurement beams

Material: Coated Fused Silica
Reference Mirror Part
Provides a stable reference path for the interferometer

Material: Ultra-flat Coated Glass
Objective Lens
Focuses light onto the test surface and collects reflected light

Material: Precision Optical Glass
Detector Array
Captures the interference pattern for digital processing

Material: CCD/CMOS Sensor Silicon

Manufacturers of Interferometric Optical Head

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Frequently Asked Questions

What is the typical wavelength of the laser used in the interferometric optical head?

The standard wavelength is 632.8 nm, typically from a HeNe laser. This is a reference value; confirm the exact wavelength for your specific model.

What is the measurement range and resolution of the head?

The measurement range is 0.1–10 mm depending on surface reflectivity, and the vertical resolution is 0.1 nm (sub-nanometer). These are reference values; verify with the manufacturer for your application.

What environmental conditions are required for operation?

The head operates in temperatures from 15–35 °C and can be stored from -10–50 °C. Relative humidity should be 20–80% non-condensing. Ensure stable temperature for accuracy.

What is the protection class of the head?

The protection class is IP54 per IEC 60529, meaning it is dust and splash water protected. This is a reference; confirm compliance with the manufacturer.

Data Basis

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Preliminary Technical Classification

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pressure:	Atmospheric pressure only (non-pressurized)
other spec:	Vibration tolerance: <0.5g RMS, Humidity: 10-80% non-condensing, Cleanliness: ISO Class 5 or better recommended
temperature:	+15°C to +35°C (operating), -10°C to +50°C (storage)

Interferometric Optical Head

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