Specification
Mechelle ® 7500
Integrated with the IStar ICCD camera from Andor
UK agents: Photonic Solutions PLC, Gracemount Business Pavilions, 40 Captains Road, Unit A2/A3, Edinburgh, EH17 8QF
Tel: +44 (0)131 664 8122 Fax: +44 (0)131 664 8144 email: [email protected] www.psplc.com
Tel +46-(0)8 6057090 Fax +46-(0)8 6057101 E-mail [email protected]
Visit our homepage - www.multichannel.se - for more sample spectra
Mechelle
®
7500 / IStar
™
ICCD
I n w a ve l e n g t h a n d t i m e ™
Page 2 of 4
Principles of the Mechelle®
The optical layout of the Mechelle® is a highly optimised large throughput design. The heart of the
system is the patented dispersion balanced order-sorting system, giving rise to a uniform distribution of the segments (spectral orders) on the square shaped CCD, giving an efficient use of the
CCD – surface. The order-sorter works more or less as an achromatic lens, correcting the very nonuniform segment distribution caused by a single prism order-sorter used in all other echelle
spectrographs on the market. The large wavelength range 200 – 1100 nm is impossible to achieve
without the Mechelle order-sorter, because the segments in the NIR – region cannot be separated
from each other.
General
Thus only the Mechelle can provide such a wavelength range with full spectral continuity and no
overlapping wavelengths. In fact, the upper wavelength range 1100 nm is set by the CCD –
detector sensitivity only, not by the Mechelle optics that easily can be realised for even larger
wavelength ranges. The low wavelength limit is set by the transmission of air.
Mechelle 7500 optics (patented)
Mounting
Patented special stigmatic coma-compensated mounting
Focal length
190 mm
F-number
5.8
Entrance aperture
25 x 50 µm
Characteristics of simultaneously recorded spectrum
Wavelength range
200 – 1100 nm
camera dependent (see below)
Total length of spectrum
about 400 mm
camera dependent (see below)
Optical adjacent order cross-talk
<10-3, 10-4 typical
Spectral resolution (λ/∆λ)FWHM
7500
in whole range FWHM (Note 2) and with specified entrance aperture,
camera dependent (see below)
Spectral characteristics for the Mechelle 7500® + IStar™ ICCD combination
Wavelength range
190 – 800 nm
Total length of spectrum
About 350 mm
simultaneously recorded (Note 6)
(Note 1)
Number of spectral channels
About 21000
(Note 1)
Width
1 pixel
13 µm in spectral image plane
Height
3 pixel
max. selectable in software
Range/channel
(single exposure)
170000 counts
depending on chosen channel height
Dynamic range / channel
(single exposure)
17 bits
(Note 5 and 4)
Spectral resolution (λ/∆λ)FWHM
3000 - 4000
Depending on image intensifier tube. Corresponding to 2 - 3 pixels
FWHM (Note 2) and with the above specified entrance aperture.
R e s o lu ti o n F W H M
L ine a r d is p e rs io n
Wavelength Resolution Linear
FWHM
dispersion
(nm)
(nm)
(nm/channels)
0 .2 6 0
0 .2 4 0
0.0186
0.0196
0.0235
0.0294
0.0353
0.0392
0.0451
0.0490
0.0549
0.0588
0.0627
0.0686
0.0745
0.0784
0.0833
0 .2 2 0
0 .2 0 0
0 .1 8 0
0 .1 6 0
)
0.063
0.067
0.080
0.100
0.127
0.133
0.153
0.167
0.187
0.200
0.213
0.233
0.253
0.267
0.283
0 .2 8 0
0 .1 4 0
0 .1 2 0
0 .1 0 0
0 .0 8 0
0 .0 6 0
0 .0 4 0
0 .0 2 0
0 .0 0 0
190
230
270
310
350
390
430
470
510
550
590
630
670
710
750
790
830
W a v e le n g t h ( n m )
Wavelength calibration
Procedure
Through Mechelle software using appropriate using a low-pressure discharge lamp
Accuracy
Better than λ/50000
Stability
Better than λ/50000
in specified wavelength range (Note 3)
Information furnished by Multichannel Instruments AB is believed to be accurate reliable. However, no responsibility is assumed for possible inaccuracies or omissions. Specifications and external
appearance are subject to change without notice. Mechelle, FindELMO, TracEM, ListEM and CSR are trademarks of Multichannel Instruments AB. Other products and company names mentioned herein may
be the trademarks of their respective owners. Copyright © 2001 Multichannel Instruments AB. All rights reserved. Printed in Sweden, IStar/M7500-2001-03-19.
870
(
190 nm
200 nm
240 nm
300 nm
360 nm
400 nm
460 nm
500 nm
560 nm
600 nm
640 nm
700 nm
760 nm
800 nm
850 nm
0 .3 0 0
Mechelle
®
7500 / IStar
™
ICCD
I n w a ve l e n g t h a n d t i m e ™
Page 3 of 4
Radiometric calibration
Procedure
Through Mechelle Software using appropriate calibration sources
Detector system
Camera manufacturer
Andor Technology Ltd
Camera model
Andor IStar DH734D-18F-03 image intensified CCD camera.
CCD – sensor type
Marconi EEV47-10
Number of pixels:
1024 x 1024 pixels
Active pixel size
Appr. 13 µm2 effective pixel size at photocathode
Pixel size:
13 µm2
Phosphor type (decay time)
W photocathode, P43/HR
Intensifier diameter
∅ 18 mm
Input window
Quartz
Gating specification
< 5 ns minimum, IntelliGate and integrated Digital Delay Generator
Sensitivity
Capable of single photon detection
Dynamic range
16 bits digitisation / pixel
Read-out rate
31 and 62 kHz, 0.5 and 1 MHz
Read-out noise (typical)
4 electrons @ 31 kHz and 10 electrons @ 1MHz
A/D conversion factor (typical)
0.7 e-/counts @ 62 kHz
Controller card
2/3 size, 32 bit PCI interface card.
Cooling
Air
Water
PC power supply –5° C
External power supply –15° C
PC power supply –20° C
External power supply –30° C
Mechanical realisation
Spectrograph dimensions
(L x W x H)
350 x 170 x 205 mm
System dimensions with camera
(L x W x H)
650 x 215 x 275 mm
Spectrograph weight
9 kg
System weight with camera
11 kg
Power unit
Standard from camera supplier
Software and PC control
Operating system
Mechelle user interface is compatible with Windows® 9x/NT.
Data storage
All data are stored as ASCII files or SPC (GRAMS/32) – format
Software compatibility
GRAMS/32, LabVIEW and all other spectrum viewing software capable of importing ASCII - files
" Initialisation of the system.
" Instrument control.
Main Mechelle Software features
" Calibration, using a spectral line source and associated wavelength files. The spectral line
positions of a few (about 3 – 7) lines are measured accurately and calibration constants are
fitted and stored. Subsequent compilation of spectrum is based on these constants. Calibration
wavelength files and calibration source recommendations are provided.
" Adding several spectra / read-out
" DDE of recorded spectra to the GRAMS/32 spectroscopic software. The software for
operation and control of the system includes:
" Definition of calibration wavelengths and calibration conditions, channel width and height,
background correction conditions, etc.
" Radiometric calibration procedure, for user specified calibration sources.
" Recording of spectrum composed of a pre-selected number of integrations. After each
integration the read-out of the CCD is made and the spectrum is built channel by channel in a
compilation procedure.
" Free running continues recording at 1 – 3 spectra/s (depending on camera)
" Complete time-resolved recordings, with delay and gate time selection, including automatic
delay time stepping
Information furnished by Multichannel Instruments AB is believed to be accurate reliable. However, no responsibility is assumed for possible inaccuracies or omissions. Specifications and external
appearance are subject to change without notice. Mechelle, FindELMO, TracEM, ListEM and CSR are trademarks of Multichannel Instruments AB. Other products and company names mentioned herein may
be the trademarks of their respective owners. Copyright © 2001 Multichannel Instruments AB. All rights reserved. Printed in Sweden, IStar/M7500-2001-03-19.
Mechelle
®
7500 / IStar
™
ICCD
I n w a ve l e n g t h a n d t i m e ™
Page 4 of 4
Minimum PC
Pentium® processor, >300 MHz with 64 MB RAM, 1 GB HD, 16 speed CD-ROM, super VGA
monitor with high colour (16 bit) display, 800 x 600 resolution. Windows® 9x/NT.
Recommended PC
Pentium II® processor, >600 MHz with 128 MB RAM, 3 GB HD, 4 MB graphic memory, 16 speed
CD-ROM, super VGA monitor with high colour (16 bit) display, 800 x 600 resolution. Microsoft
Windows® 9x/NT. Compatible laserprinter recommended.
Optional accessories (see also separate specifications)
FindELMO™
Spectral identification add-on analysis module to GRAMS/32. Database software for finding
elements and molecules in the displayed spectrum.
GRAMS/32
Spectroscopic Software Suite
Display and analysis software for post-processing of spectra. The complete spectroscopy software
suite for all your data importing, processing, viewing, organising, and accessing needs. Compatible
with Windows® 9x/NT.
GRAMS/32 3D
Extend the power of GRAMS/32 with a real-time, interactive 3D graphic visualisation application
capable of animating data sets with millions of data points in real time with great ease and speed.
Mechelle Calibration Source
Low-pressure discharge source, of fluorescent tube type
Mechelle Collector/Collimator
To match the performance of modern broadband spectrographs, a unique UV - NIR achromatic
collecting/collimating lens system has been designed. It is optimised to ensure that all wavelengths
in the range 200 – 1100 nm are collected similarly into the entrance fibre of the spectrograph.
Adjusted for all Mechelle models.
Collector/Collimator alignment
laser system
For laser aiming of the collector/collimator. A very useful device is the aiming laser that can be
coupled to the input fiber. Observing the laser spot on the object enables easy adjustment of focus
and orientation.
Mechelle UV Enhancer
Enhancing region 230 – 400 nm. Other regions are available.
Extra FO input cable
With SMA – connectors
Integrated sphere
2 m with SMA connectors with FO input
Regulatory compliance
The Mechelle spectrographs comply with the EMC and LV Directives of the European Union.
Mechelle warranty
Warranty
The Mechelle spectrographs including their accessories have one (1) year warranty according to
our standard terms and conditions.
Notes
Note 1
The spectrum is composed of segments selected from each order so as to give spectral continuity
and optimal efficiency in each segment. The total length of the spectrum is the length of all these
segments linked together. When the spectrum is compiled this length is recorded in channels, the
number of which is given by [total spectrum length]/[channel width].
Note 2
As the spectrum is composed of several segments from different orders, the dispersion, being
proportional to the spectral order, varies. As the channel width (1 pixel) and the width of the slit
image are constant, an important consequence is that the quantity λ/∆λ (where ∆λ in general is the
wavelength equivalent of a linear quantity on the detector surface) is approximately constant over
the whole range. This is an advantage in comparison to single-order spectral recording where the
constant dispersion gives a spectral resolution that decreases with the wavelength.
Note 3
The calibration accuracy and stability is related to spatial accuracies in the focal plane, and is
therefore an approximately constant fraction of the wavelength for the reasons outlined in Note 2.
The dynamic range given, is valid for a single integration with the specified spectral channel
dimensions. The dynamic range D of a recorded spectral channel is in general expected to follow
the relation.
Note 4
D
H
=
=
(H x W x I)½ x Dp
channel height (pixels)
I
W
=
=
number of integrations
channel width (pixels)
Dp
=
dynamic range of a single pixel
Note 5
The dynamic range is defined as the ratio of the maximum unsaturated signal to RMS dark noise.
Note 6
200 – 640 nm with full spectral continuity
640 – 800 nm with gaps. Spectral coverage about 70 %.
Information furnished by Multichannel Instruments AB is believed to be accurate reliable. However, no responsibility is assumed for possible inaccuracies or omissions. Specifications and external
appearance are subject to change without notice. Mechelle, FindELMO, TracEM, ListEM and CSR are trademarks of Multichannel Instruments AB. Other products and company names mentioned herein may
be the trademarks of their respective owners. Copyright © 2001 Multichannel Instruments AB. All rights reserved. Printed in Sweden, IStar/M7500-2001-03-19.