MacroRAM™

Overview

The new MacroRAM™ Raman spectrometer brings simplicity to Raman measurements without compromising the ability to handle even the most complex samples. Its compact and robust design, including Class 1* laser safety means it's safe for use in most environments, from undergraduate teaching labs to industrial QC applications.

Raman – it’s not just for experts anymore!

No one has more experience in designing and manufacturing high quality Raman systems than HORIBA Scientific, from modular Raman microscopes to triple Raman spectrometers. The MacroRAM extends HORIBA’s Raman offerings to a bench-top Raman spectrometer for macroscopic measurements. Using superior optical components and design, the MacroRAM is an easy-to-use, yet highly sensitive instrument for both routine and complex Raman measurements.

Features

  • Compact and robust design

  • User-friendly interface

  • Flexible sample handling

  • Best in class sensitivity

  • Safe operation

  • Affordable

Hardware

Laser

MacroRam laserThe MacroRAM uses a 785 nm diode-pumped solid-state laser, with tunable output power from 7 mW to 450 mW and full width half maximum of 0.1 nm.  The power is controllable through LabSpec6 software, scaling linearly from 0% (off) to 100% (full power).  The laser source is filtered through a narrow bandpass filter before being focused onto the sample in the sample compartment.  Raman signal is collected in the back scattered direction and filtered using either an edge or notch filter, depending on the configuration of the MacroRAM (Stokes or Stokes/anti-Stokes).

Spectrograph

The MacroRAM contains a fixed spectrograph for analysis of the resulting Raman signal.  It is equipped with a 685 gr/mm holographic grating for superior stray light rejection.  A spectrum is obtained by positioning a detector at the focal plane of the fixed spectrograph.  The dispersion is 10.3 nm mm-1 and provides a resolution of 6 cm-1 at 912 nm for the Stokes version and 7 cm-1 at 852 nm for the Stokes/anti-Stokes version.

Sample Compartment

MacroRam sample compartmentThe sample compartment positions the sample at the focal point of the detection optics for optimal coupling to the spectrograph and detector.  A lens focuses light from the excitation laser to the sample, and the Raman signal is collected along the same path in a back-scattered Raman configuration directing the signal to the fixed spectrograph and detector.  The sample compartment accommodates various optional accessories – see the Accessories tab for a complete list.

Detector

HORIBA Syncerity detectorEach MacroRAM contains a multichannel CCD detector, to record a full spectrum of the resulting Raman signal from the sample.  It uses a back illuminated near-IR optimized Syncerity CCD cooled to -50°C for the highest available in-class sensitivity.  The use of the Syncerity CCD with the MacroRAM’s fixed spectrograph provides 3400 cm-1 of total spectral coverage (100 cm-1 to 3400 cm-1 for Stokes version and -1700 cm-1 to 1700 cm-1 for Stokes/anti-Stokes).  A correction file is stored to correct for wavelength dependencies of each optical component.  The files are created at HORIBA Scientific for every instrument and are automatically applied to data through the LabSpec software.  Full details of the sensor can be found here.

External Probes

Each MacroRAM is equipped with the capability to connect an external probe for remote sample measurements.  The excitation source is passed through the sample compartment to a fiber where it is coupled to the LASER OUT port on the MacroRAM.  An FC/PC terminated fiber may then be connected from the LASER OUT port to an external probe.  The returning signal can then be connected using an FC/PC terminated fiber to the SIGNAL IN port on the MacroRAM.  An internal fiber then passes the signal to the fixed spectrograph and CCD detector for analysis of the Raman signal.  An external interlock, key switch, and safety shutter ensure safe operation when the laser is used in an external configuration.  To enable operation of the shutter, the key switch must be set to ENABLE.

The external interlock can be used to connect to any number of additional safety measures, for example a door switch.  The interlock is comprised of a two pin connector; continuity must be maintained between the two pins to enable laser output.  If continuity is interrupted, the shutter will automatically close, blocking the laser output.

For a selection of compatible external probes, please see the Accessories tab.

Software

LabSpec 6 Spectroscopy Software

The LabSpec6 spectral software suite used on all the HORIBA Jobin Yvon analytical and research Raman spectrometer systems is now also available for modular Raman systems. It has been designed and written as a dedicated Raman spectroscopy package and offers many powerful capabilities not found in a basic spectroscopy software.


Manufactured by HORIBA

Specifications

Wavelength

785 nm

Laser Power

7 mW – 450 mW

Laser Safety

Class 1, internal sample compartment Class 3b, external probe

Dispersion
(nm mm-1)

10.3

Spectrograph f/#

3.3

Spectrograph Focal Length

115 mm

Spectral Range
(cm-1)

100 – 3400 cm-1 (Stokes)
1700 – 1700 cm-1 (Stokes/anti-Stokes)

Detector Type

Back illuminated near-IR CCD

Sensor Size

2048 x 70

Pixel size

13 µm

Detector cooling

-50°C

Dynamic Range

42,550:1

CCD Dark Current (e-/pixel/s)

0.05

Spectral Resolution (cm-1)

6 cm-1 at 912 nm (Stokes)
7 cm-1 at 852 nm (Stokes/anti-Stokes)

Dimensions
(W x D x H)

432 mm (17”) x 432 mm (17”) x 381 mm (15”)

Weight

45 lbs (20.4 kg)

Ambient Temperature Range

15 – 30°C (59 – 86°F)

Maximum Relative Humidity

75%

Power

Universal AC single-phase input power; 100-240 V AC; line frequency 50 – 60 Hz

Fuses

One 5 x 20 mm IEC approved, 2.0 A, 250 V, time delay fuse

Operating System

Windows® 7 32- or 64-bit recommended

Accessories

J1955 HPLC Flow Cell

With a sample capacity of 20 μL, this non-fluorescing fused silica cell is ideal for on-line monitoring of Raman samples. The cell maintains high sensitivity because it has a large aperture for collecting the excitation light to the sample and spontaneous Raman emission from the sample. The flat sides allow maximum throughput while keeping the scattering of the incident radiation to a minimum. The cell fits in a standard cell holder.

1925 Quartz Cuvette

With a 4-mL volume, this cell measures 10 mm × 10 mm in cross-section, and comes with a Teflon® stopper to contain volatile liquids.

1920 Sample Cell

This 2-mL to 4-mL non-fluorescing fused silica cell can accept a magnetic stirrer, has a 10-mm path length, and includes a white Teflon® cap that prevents sample evaporation.

FL-1027 Single-Position Thermostatted Cell Holder

The FL-1027 Single-Position Thermostatted Cell Holder keeps a sample at a constant temperature from ‑20°C to +80°C. The temperature is maintained by an ethylene glycol-water mixture pumped through an external circulating temperature bath (not included).  The holder also includes a magnetic stirrer, enabling mixing of turbid or viscous samples. Also required is the FM-2003 Sample Compartment Accessory.

J1933 Solid Sample Holder

The J1933 Solid Sample Holder is designed for samples such as thin films, powders, pellets, microscope slides, and fibers.  The holder consists of a base with a dial indicating angle of rotation, upon which a bracket, a spring clip, and a sample block rest.

SuperHead

The SuperHead is a high efficiency remote Raman probe which enables in situ non-invasive chemical analysis to be undertaken.  The purpose of the SuperHead is to efficiently deliver the laser beam to the sample material, and to collect and filter the returning Raman signal.

The SuperHead uses a single FC/PC terminated fiber for delivering the laser excitation and another FC/PC terminated fiber for signal collection. High efficiency filters incorporated within the probe provide effective laser and Raman filtering.

The SuperHead can perform measurements in a non-contact / non-invasive mode or in an immersion mode, using specific accessories.

F-3030 Temperature Bath

For studies of samples whose properties are temperature-dependent, use the F-3030 Temperature Bath. The controller circulates fluids externally, with tubes leading to the sample chamber. The temperature range is from –25°C to +80°C. Sensor and all cables are included with the F-3030. The Temperature Bath is available in a 110-V and 220-V version.


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