Measurement is Knowledge

The device measures lens center thickness, preferably of previously centered lenses. A central clamp aligns the test pieces centrally to two measuring feelers via their diameter. The feelers are then closed pneumatically and offset against each other in separate digital display electronics. The lens center thickness is displayed immediately. The diameter of the central clamp can be preset, which hugely simplifi es operation when measuring several lenses of the same type.

In order to obtain information quickly about the center thickness of small lenses in the manufacturing process, an extended version of the existing lens center thickness gauge VP 30195 is also available. The device has an integrated laser centering device and can therefore measure even uncentered lenses without any problems.

LENS Ø
15 mm – 150 mm

MEASURING RANGE
60 mm

ACTUATION
manual (hand and foot control)

WEIGHT
approx. 15 kg
(excluding display and control unit)

DIMENSIONS
400 mm × 340 mm × 420 mm (L × W × H)

REQUIRED INFRASTRUCTURE
230 V main voltage and compressed air
low-vibration installation required

The device measures centering errors (surface tilt errors) on individual lenses and on cemented elements in accordance with ISO 10110. The precise and ergonomic V support plate guarantees fi rm support for the lens starting at 5 mm lens diameter.

LENS Ø
5 – 200 mm

RADIUS OF CURVATURE OF THE LENS SURFACES
≥ 5 mm

LENS THICKNESS
Minimum center thickness 0.5 mm, maximum center thickness – limited by clearance between support ring and feeler head

COATED SURFACES
As the refraction of the refl ected beams is measured, given the wave length 635 nm the residual reflection must be > 0.05 %.

ELECTRICAL CONNECTION

• 230 V, 50 Hz
• 100 VA via IEC connector
• DIN 49 457B IEC 320/VI

WEIGHT

• Mechanical/optical facility: approx. 100 kg
• Electrical supply and display device: approx. 5 kg
• Support ring 0.2 – 1.5 kg depending on size

DEVICE COMPONENTS - SENSOR HEAD
The sensor head consists of 2 symmetrical,
identical systems for top and bottom view

The system is operated via a Windowsbased analysis computer.

Our highly specialized measuring systems determine the two-dimensional transfer function (2d MTF) of an object in real time. The test function (the Dirac impulse) is realized using pinholes of different diameters.

The systems can be freely parameterized and allow a semi-automatic measuring method. The resulting parameter data records are managed in a relational database. The same applies to all of the measuring data acquired. An extensive export option, e.g. to Excel, facilitates links to existing QS systems.

A flexible quick release support in a precise and generously dimensioned pivot bearing holds the test pieces. The systems should be kept at a constant temperature (+–2 degrees). For certain measurements, a vibration-free environment is required. The VP 30370 system is mounted on an air-bearing table.

The accuracy of the overall system is calibrated on the basis of special lenses gauged by PTB.

DEVICE COMPONENTS

• sensor head camera and scan lens
• target
• switch cabinet
• analysis and operating computer

THE MEASURING HEAD
The measuring head consists of several motorized adjustment units of a special CCD camera (cooled) with optimized and specially fine-tuned measuring lenses (highly accurate and gauged), the illumination (stabilized), and exchangeable filter wheels (custom made) adapted to the transfer chain (for quick change of the measuring color).

THE ANALYSIS COMPUTER
The system is operated via a Windowsbased analysis computer. 

MEASURING RANGE
theoretically up to more than1000 LP/mm,
verifi ed up to 250 LP/mm

OO´

• infinite
• finite: min. 1 m and max. 6 m on the optical axis or 3 m with maximum angle of view

MAXIMUM ANGLE OF VIEW
42 degrees

Y´
+–50mm

PARAMETERS TO BE MEASURED

• flange focal distance
• focal distance
• MTF via spatial frequency with image
• height sequence
• asymmetries
• field curvature
• distortion via focal distance variation
• longitudinal chromatic aberration
• latitudinal chromatic aberration

WEIGHT
approx. 1500 kg

CONNECTION CONDITION

• 230V /32 A
• 6 bar (cleaned, oil-free) air