eagle raman-s product specification -...

Ibsen Photonics A/S, Ryttermarken 15-21, DK-3520 Farum, Denmark / Tel.: (+45) 44 34 70 00

Validation date: 13-Jan-2016

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EAGLE Raman-S

Product Specification

EAGLE Raman-S Product Specification



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Table of Contents

1 Introduction ............................................................................................................. 3

2 Principle of operation ........................................................................................... 4

2.1 Spectroscopy ................................................................................ 4

2.2 EAGLE Raman-S ............................................................................ 5

3 Specifications ........................................................................................................... 7

3.1 Specifications ................................................................................ 7

3.2 Parameter definitions: .................................................................... 7 3.2.1 Wavelength range .................................................................................................................... 7 3.2.2 Numerical aperture (NA) ........................................................................................................ 7 3.2.3 Minimum optical resolution .................................................................................................... 7 3.2.4 Grating efficiency ..................................................................................................................... 7 3.2.5 Stray light .................................................................................................................................. 8 3.2.6 Wavelength drift ....................................................................................................................... 8

3.3 Dimensions ................................................................................... 8

4 Operation with VersaPic USB/RS-232 Controller and software ........... 9

4.1 OEM Spectrometer Software ........................................................... 9 4.1.1 Drivers ...................................................................................................................................... 10 4.1.2 Firmware (RS-232/USB) commands .................................................................................. 10 4.1.3 Software Development Kit (SDK) ....................................................................................... 10 4.1.4 VersaSpec ................................................................................................................................ 11 4.1.5 Operation of TEC software ................................................................................................... 11

4.2 VersaPic Electronics specifications ................................................... 11

4.3 TE Cooling Controller ..................................................................... 12

5 Operation with iVac 316 camera .................................................................... 12

6 Wavelength Calibration ...................................................................................... 13

7 Fiber bundle imaging .......................................................................................... 13

8 Related documents .............................................................................................. 14

9 Revision history .................................................................................................... 14




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1 Introduction

The EAGLE Raman-S is a robust, athermal, industrial grade diode array based

spectrometer especially well-suited for Raman Spectroscopy.

The key features of the product are:

Wavelength range 800 – 1100 nm to enable both 785 and 830 nm laser

wavelengths.

High resolution of 0.3 nm (4 cm-1 @ 830 nm)

High NA of 0.3 (f-number 1.6)

Highly efficient transmission grating design

The key benefits of the product are:

High throughput

Robust and athermal design

Support for multiple detector/camera types

Error free imaging of tall slit in image plane

See also Table 3 for more details on the specifications of the EAGLE Raman-S

spectrometer.

This document is a detailed product specification describing the EAGLE Raman-S principle

of operation (see Chap. 2) and technical specifications (Chap. 3).

EAGLE Raman-S as standard can be supplied with either a Hamamatsu 1-stage TE cooled

BT-CCD detector or the deeply cooled Andor iVac 316 camera. These options are described

further in Chapter 4 and 5.




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2 Principle of operation

2.1 Spectroscopy

The Eagle RAMAN-S is well suited as OEM spectrometer in a Raman spectroscopy system (see

figure 1) due to the high optical throughput and high resolution. The 800 – 1100 nm

wavelength range enables EAGLE Raman-S to be used both with a 785 nm and a 830 nm laser

with the basic spectral coverages listed in Table 1. The EAGLE Raman-S can also be used for

many other applications requiring high sensitivity and high resolution.

Figure 1: Raman spectroscopy system

Table 1: Raman range examples

Excitation wavelength 785 nm 830 nm

Range 200 – 3650 cm-1 0 – 2960 cm -1

Minimum resolution ~4 cm-1 (0.3 nm)




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2.2 EAGLE Raman-S

Figure 2: Optics schematic diagram.

The schematic diagram for the optics of the EAGLE Raman-S spectrometer is illustrated in

Figure 2. The EAGLE Raman-S is based on Ibsen Photonics’ LGL platform utilizing a collimating

lens system, a transmission grating and a focusing lens system. The EAGLE Raman-S uses a

high diffraction efficiency fused silica transmission grating produced by Ibsen Photonics

internally. Typical diffraction efficiency is shown in Figure 3.

Figure 3: Typical diffraction efficiency of Ibsen transmission grating.

The numerical aperture of the spectrometer is 0.3 (equivalent to an f-number of 1.6),

which means that the spectrometer can accept a wide cone of light.

The EAGLE Raman-S spectrometers can be configured by Ibsen with a range of input slits

providing the optical FWHM resolution that best suits your requirements. Since a slit will




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limit the amount of available light on the detector we always recommend that you work

with the largest possible optical resolution that is acceptable in your application. In Figure

4 you can find the relation between slit width and resolution.

Figure 4: FWHM resolution of EAGLE Raman-S as a function of input slit width

in wavelength (nm).

EAGLE Raman-S supports as standard two different detector options, with different

benefits as outlined in Table 2. However, Ibsen Photonics can in most cases customize an

EAGLE Raman-S spectrometer to accept almost any other line array detector or even a

third party camera. Please, contact Ibsen Photonics directly to discuss adaptation to a

non-standard detector array.

For specifications of the electrical interface to the line array detectors please see the data

sheets for the individual detectors.

Table 2: Line array detectors supported by EAGLE Raman-S.

Detector Hamamatsu S7031-1007S BT-CCD Andor iVac 316

EAGLE Raman-S Part number

ENS-392 ENS-C316

Cooler 1-stage TE -60 Deg. C cooling

Number of pixels 1024 2000

Pixel pitch 24 µm 15 µm

Pixel height 2,928 µm 3,800 µm

Technology BT-CCD LDC-DD

Benefits Low cost Long integration time/high sensitivity

Documentation Ref. [1] Ref. [2]




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3 Specifications

3.1 Specifications

Table 3: EAGLE Raman-S specifications (typical values)

Parameter ENS-392 ENS-C316 Comment

Wavelength range 800 – 1100 nm 800 – 1100 nm

Numerical aperture 0.3 0.3

Minimum Optical resolution 0.3 nm 0.3 nm FWHM 20µm slit

Stray light < 0.03 % < 0.03 % At +/- 40 nm from peak

Detector

Hamamatsu

S7031-1007S BT-CCD

Andor

iVac

316

Dimensions 124 x 185 x 239 mm x mm x mm

128 x 152 x 248 mm x mm x mm

Excluding fiber

Weight 3.5 kg 3.5 kg Excluding fiber

Operating temperature interval

0 to + 40 oC 0 to + 40 oC Non condensing

Storage temperature -25 to + 50 oC -25 to + 50 oC

Temperature drift < 0.01 nm / oC < 0.01 nm / oC

Specifications are subject to change without prior notice.

3.2 Parameter definitions:

3.2.1 Wavelength range

The wavelength range is defined as the range of wavelengths that is captured by the

detector.

3.2.2 Numerical aperture (NA)

The numerical aperture of the spectrometer defines the range of angles by which the

spectrometer can accept light.

3.2.3 Minimum optical resolution

The resolution is defined as the FWHM peak width as measured by the spectrometer when

the input is a single wavelength (i.e. a monochromatic light source). The minimum

resolution is the smallest resolution that can be obtained with the spectrometer.

3.2.4 Grating efficiency

The grating efficiency is the absolute diffraction efficiency for the transmission grating

including AR-coating.




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3.2.5 Stray light

Stray light is measured as the light at wavelengths of +/- 40 nm on each side of the peak

recorded, when the input is a monochromatic light source.

3.2.6 Wavelength drift

The wavelength drift is defined as a wavelength shift per degree C.

3.3 Dimensions

The spectrometer dimensions are shown in Figure 5 for EAGLE Raman-S ENS-C316. Note that

all dimensions are given in mm.

Figure 5: Spectrometer dimensions of ENS-C316.




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Figure 6: Spectrometer dimensions of ENS-392.

4 Operation with VersaPic USB/RS-232 Controller and software

The EAGLE Raman-S version ENS-392 is supplied with the VersaPic USB/RS-232

controller, TE controller, drivers, and software.

4.1 OEM Spectrometer Software

Ibsen offers a software platform for the ENS-392 spectrometer. In Figure 7 you can see a

summary of the various software levels.




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Figure 7: Overview of software interface.

4.1.1 Drivers

In order to get communication to work with the spectrometer you need to install a USB

driver and a virtual COM port driver. These can either be downloaded from the Ibsen

Photonics home page (go to http://www.ibsenphotonics.com/about/customers/customer-

download/versaspec-v3-1-6 and type the password provided by your sales representative)

or the FTDI home page.

4.1.2 Firmware (RS-232/USB) commands

The lowest level that you can communication with the spectrometer is by Firmware

commands. These will provide you with most flexibility but is also requires most work

since you have to perform the communication command by command. The Firmware

command set is independent of operating system so you are not tied to using Windows for

instance. A Firmware Command Reference Manual can be provided on request.

4.1.3 Software Development Kit (SDK)

The SDK operates at a layer above the Firmware commands using a set of Windows

DLL´s. These DLL's group several firmware commands into more convenient function calls

to make it easier to program using C, LabVIEW or similar higher level programming

http://www.ibsenphotonics.com/about/customers/customer-download/versaspec-v3-1-6

http://www.ibsenphotonics.com/about/customers/customer-download/versaspec-v3-1-6




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languages. The Software Development Kit has its own User's Manuals included in the

package as well as some programming examples.

4.1.4 VersaSpec

The VersaSpec software is an application software that runs under Windows mostly

intended for quick evaluation of our spectrometers. You can set basic parameters like

integration time, number of averages but most of the Firmware parameters cannot be set

by the VersaSpec.

4.1.5 Operation of TEC software

The detector in the spectrometer is cooled using a Thermo-Electric cooling element

mounted inside the detector package. Software for controlling the Thermo-Electric cooling

of the detector array can be downloaded from the Ibsen Photonics home page (go to

http://ibsen.com/about/customers/customer-download/tecconfig-v-1-2-0/ and type the

password provided by your sales representative). See section 4.3 for more information on

TEC control.

4.2 VersaPic Electronics specifications

Electrical Parameters

Power supply USB-Hub powered or + 6 ... 16 V DC

Operation current <150 mA (on USB)

Quiescent current (power down)

< 5 mA (interface dependent)

Analog to Digital Conversion Unit

Resolution 16 bit, 2 bit RMS (without oversampling), 4 bit INL, no missing code

Sampling speed 10 MS/sec.

Sampling mode Sample and Hold: 1, 4 - fold prog. oversampling

or Correlated Double Sampling

Inputs 2 (odd and even), programmable for positive or negative video signals

Input full scale range 2 V or 4 V, programmable

Gain 1...5 programmable in 64 steps

Offset External compensation or programmable up to +/- 300 mV

Interfaces

USB 2.0 Full speed (12 Mbit/sec) (virtual COM Port)

RS232 8, N, 1, RxD, TxD, no flow control up to115200 bit/sec.

TTL-UART up to 921600 bit/sec

SPI up to 5 Mbit/sec.

Process control

Trigger input TTL, slope programmable

http://ibsen.com/about/customers/customer-download/tecconfig-v-1-2-0/




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Shutter output TTL, programmable state and delay

Flash lamp control programmable flash length, programmable burst

Figure 8: Dimension of VersaPic Controller.

4.3 TE Cooling Controller

The EAGLE Raman-S ENS-392 spectrometers version includes a thermo electric cooled

detector array and control electronics. The Spectral DATA and TE control is done over two

mini-USB ports as shown on Figure 9. Furthermore, the electronics requires 12 VDC as

indicated on the Figure.

Figure 9: Electrical connectors on EAGLE Raman-S ENS-392.

5 Operation with iVac 316 camera

The ENS-C316 variant of EAGLE Raman-S is supplied with the Andor iVac316 camera.

Please refer to the datasheet for this camera for more information [2].




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6 Wavelength Calibration

The EAGLE Raman-S is wavelength calibrated at a fixed temperature of 25 deg. C according to a polynomial of 4th degree:

Eq. 1 1..0,nm max

4

4

3

3

2

21 NpixpixBpixBpixBpixBA

This equation describes the relation between the beam spot position (pix) on the detector

array and the optical wavelength (). Nmax is the number of pixels in the detector array.

The coefficients A, B1, B2, B3, and B4n are measured for each EAGLE Raman-S unit and are

supplied with the Certificate of Conformance. In case the Ibsen Photonics VersaPic

controller electronics is used, the coefficients are stored in flash memory on the VersaPic

board during manufacturing. The coefficients are used by the VersaSpec Windows software

to display the measured power versus wavelength directly. If you need to write your own

software it is possible to read the coefficients by using the firmware commands as

described in the respective manuals.

7 Fiber bundle imaging

In order to couple as much light from your sample into the spectrometer as possible it is

common to use a fiber bundle of many multi-mode fibers. Typically the fibers are aligned

in a linear array at the input to the spectrometer.

The EAGLE Raman-S supports a tall slit/linear array of fibers of up to 3 mm total height

and images this 3 mm high line accurately onto the detector with virtually no distortion

(for instance smile) over the complete wavelength range from 800 to 1100 nm. See Figure

10 for a plot of the fiber input imaging from 800 to 1100 nm.

Figure 10: Image of a 3 mm wide fiber array in image (detector) plane of EAGLE Raman-S.




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8 Related documents

ID Document

[1] Hamamatsu S7031-1007 Data Sheet

[2] Andor iVac 316 Data Sheet

[3] VersaPic and software VersaSpec V3.x, Operating Instructions

[4] Firmware Commands VERSA PIC, Operating Instructions

[5] TEC Config manual

9 Revision history

Revision no. Author/Date Revision

1.0 PKE/9Feb16 First version

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