Bentham Instruments Limited

+44 (0)118 975 1355http://www.bentham.co.uk

Request Information

BPC300 Photochromic Lens Spectrophotometer

The BPC300 spectrophotometer offers accurate characterisation of photochromic (photosensitive) lens transmission in the faded and AM2 conditioned states.

5

The fully automated BPC300 enables product testing of prescription and non-prescription sunglasses in accordance with international standards, and the development of photochromic formulations.

The versatile BPC300 permits darkening and fading-back kinetic studies, whilst the modification of sample temperature, conditioning beam illuminance and spectrum accounts for a broad range of lens exposure conditions. An optional polarising lens capability is on offer for the extension of the measurement scope.

Core benefits

Features

  • Monochromator based, collimated tuneable light source (280-780nm)
  • Temperature-controlled water bath with mount for plano lens sample
  • AM2 conditioning beam (including facility to attenuate and filter spectrum)
  • Optically chopped monochromatic beam with lock-in signal recovery enables measurement under AM2 activation
  • Automated reference level measurement
  • Fully-automated by Windows application including establishment and running of pre-defined measurement profiles
  • Generation of measurement report including parameters required by standards

Applications

  • ISO/ EN 8980-3:2013 - “Ophthalmic optics. Uncut finished spectacle lenses. Transmittance specifications and test methods.”
  • ISO/ EN 12312-1:2013 - “Eye and face protection. Sunglasses and related eyewear. Sunglasses for general use.”
  • ANSI Z80.3: 2015 - “Non-prescription Sunglass and Fashion Eyewear Requirements.”
  • A S/NZS 1067-2016 - “Sunglasses and fashion spectacles.”

Reported Parameters

  • τV0 : Luminous transmittance in the faded state at (25±2)°C
  • τV1 : Luminous transmittance in the darkened state at (25±2)°C
  • τV0 /τV1 : Photochromic Response
  • Lens category
  • Colourimetric parameters: CIE 1931 & CIE Lab
  • τSUVA : Mean UVA spectral transmittance weighted by AM2
  • τSUVB : Mean UVB spectral transmittance weighted by AM2
  • Qsign : Visual attenuation coefficient for red, green, blue and yellow incandescent
  • τsb : Solar blue light transmittance
  • The rate of darkening and fading at a single wavelength

Optional reports include:

  • τVW : Luminous transmittance at (5±2)°C
  • τVS : Luminous transmittance at high temperature (35±2)°C
  • τVA : Luminous transmittance at reduced solar simulator level and (25±2)°C

Measurement

Spectral range of operation280-780nm
Bandwidth5nm
Wavelength accuracy± 0.1nm (2400g/mm), ± 0.2nm (1200g/mm)
Beam diameter at sample plane4mm diameter
Measured transmission range0.5-100%
Maximum sample diameter75mm
Conditioning beamAM2 with requirements of ISO8980-3:2013
0-50klx
Shutter
Optional filtering
Temperature range5-50°C
Temperature accuracy± 0.2°C
Bench space required1m deep x 2.5m wide
Services requirements6 x main sockets 1200W power consumption
Nitrogen gas supply where measurements below ambient are required

Monochromatic Probe Source

UV source30W Deuterium lamp
UV-Vis source100W Quartz Halogen lamp
Monochromator configurationSymmetric, single Czerny-Turner
Monochromator focal length300mm
Diffraction gratings2400 & 1200 g/mm
Diffraction grating mountTriple grating turret
Dispersion5.4nm/mm (2400g/mm)
2.7nm/mm
Bandwidth5nm
Wavelength accuracy± 0.1nm (2400g/mm)
± 0.2nm (1200g/mm)
Chopping frequency175 Hz (typical)
Beam diameter at sample plan4mm diameter

 

bpc300 measurement data darkened and faded state

bpc300 measurement data darkening process

bpc300 measurement data fading process

Water Bath

Temperature range5-50°C
Temperature accuracy±1°C

Conditioning Beam

Spectral matchAM2 with requirements of ISO8980-3:2013
Beam illuminance0-50klx
Beam filteringOptional filtering

Computer requirements

OSWindows 7, Windows 8 (32-/64-bit) operating systems (or newer)
Software controlBenWin+ Spectral acquisition software
Minimum hard disk spaceApprox. 100MB
Minimum RAM2 GB
Interface4 x USB 2.0 ports

 

What’s new

  • download

    Introducing the TLS120Xe high power tuneable light source

    News | 1 May 2018

    Bentham Instruments is pleased to announce the introduction of the TLS120Xe high power tuneable light source. Delivering superlative stability and continuous tuning over 280-1100nm, put the power of monochromatic light at your fingertips.

  • csm

    PVE300 Photovoltaic EQE (IPCE) and IQE solution

    Products | 16 Jan 2018

    The PVE300 system is an essential tool in photovoltaic research and production line quality processes, employed in the accurate determination of solar cell spectral response/ EQE (IPCE) and IQE.

  • 6

    PhotoTest450 Portable In Vivo Monochromator Phototesting

    Products | 16 Jan 2018

    The PhotoTest450 is a trolley-based high irradiance source of UVB-UVA– and visible monochromatic radiation, designed for in vivo application, representing a key tool in phototoxicity testing, photogenotoxicity testing and in the investigation of potential phototoxic risk in trials of topical and systemic drugs.

  • 5

    BPC300 Photochromic Lens Spectrophotometer

    Products | 16 Jan 2018

    The BPC300 spectrophotometer offers accurate characterisation of photochromic (photosensitive) lens transmission in the faded and AM2 conditioned states.

  • 4

    ULS300 Variable, Constant Colour Temperature Luminance Source

    Products | 16 Jan 2018

    The ULS300 is designed for applications requiring a variable, yet Constant Colour Temperature (CCT), luminance source. Comprising a stable 250W quartz tungsten halogen lamp (QTH), light is transported to a 300mm diameter integrating sphere via an eight branch fibre for homogeneous illumination.

Search all our content