IDR150 Double Monochromator

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The IDR150 double monochromator offers superior stray light performance and detector signal recovery electronics in a single compact transportable unit.

Composed of two 150mm focal length Czerny-Turner monochromators arranged for additive dispersion with a stepping motor driven sine bar grating drive, the IDR150 can be configured to include a single or dual exit ports. Grating drive control electronics are located to the base of the unit alongside the signal recovery electronics required to interface up to two detectors, including a dual-channel picoammeter and a high voltage power supply for operation of detectors in the photoemissive or photoconductive modes.

Core benefits

Superlative stray light performance
Compact and reliable monochromator
Benefit of a single-unit solution
High accuracy across UV-vis-IR applications

Features

Two 150mm focal length monochromators in Czerny-Turner mount
Sine bar driven pair of interchangeable, kinematically mounted diffraction gratings
One entrance and up to two exit ports, with automated mirror-based selection
Integrated drive electronics, dual-channel picoammeter and high voltage power supply
Compatible with the full range of sources, detectors and accessories of the Bentham portfolio
Fully automated through USB 2.0 interface

Optical Layout

Configuration	Pair symmetrical Czerny Turner monochromators, additive dispersion
Focal length	- Total focal length: 300mm - Individual units: 150mm
Grating mount	Kinematic
Number of gratings	1 pair
Grating size	33x33mm
Aperture ratio	f/4
Number of entrance/exit ports	1 entrance, 1-2 exits
Spectral range	Within range 200nm-2400nm

Opto-Mechanical

Wavelength scanning	By integrated stepping motor and micro-stepping drive electronics
Slit type	Fixed, micrometer or motorised variable
Slit width & height	10µm-10mm (W) x 20mm (H)
Filter size	- 6 position filter wheel : 25mm diameter - 8 position filter wheel : 22mm diameter

Optical Performance (quoted for typical 2400 g/mm gratings)

Spectral range	200-600nm
Linear dispersion	1.35nm/mm
Wavelength accuracy	± 0.15nm, ± 0.05nm with software correction
Wavelength reproducibility	± 0.05nm
Resolution full/reduced slit height	0.25/0.1nm
Stray light rejection at 2.5 FWHM	10^-8
Wavelength sweep speed	30nm/s

487 Dual-Channel Picoammeter Module - Electrical

Channel 1 input	Current input to picoammeter
Channel 2 input	Current input to picoammeter
Gain ranges	10¹⁰-10⁵ V/A
Maximum current Input	100µA
Frequency response	DC to 30Hz
Gain accuracy	+1%
Gain stability	200ppm/°C
Output stability	5ppm/°C to 500ppm/°C depending on sensitivity
Linearity	< 0.025% departure from linearity from zero to full scale
ADC resolution	4½ digit BCD (0 to 19999) i.e. > 14 bit resolution
ADC integration time	100ms
Auxiliary input range	0- 9.8V
Picoammeter input impedance	Virtual earth
Auxiliary input impedance	1 MΩ

415 High Voltage Power Supply Module - Electrical

Output voltage range	-350 to -1500V
Maximum current	1.5mA
Temperature stability	100 ppm/°C
Stability to voltage fluctuations	25ppm for 10% change in line voltage
Ripple and noise	100ppm peak-peak

Monochromator Configurations

IDR150 Inline Configuration
IDR150 Compact Configuration
IDR150 Dual Configuration

Diffraction Gratings

A range of gratings are available depending on the spectral range of consideration. Diffraction gratings are supplied in pairs, on kinematic mounts to permit easy installation in the IDR150 without compromising the wavelength calibration.

Grating	Line density (g/mm)	Grating type & Blaze wavelength	Maximum wavelength range (nm)
GA-G1524H0U25	2400	Plane holographic, 250nm blaze	200-600
GA-G1518H0U25	1800	Plane holographic, 250nm blaze	200-800
GA-G1518R0U5	1800	Plane ruled, 500nm blaze	200-800
GA-G1512R0U4	1200	Plane ruled, 400nm blaze	300-1,100
GA-G1512R0U5	1200	Plane ruled, 500nm blaze	300-1,100
GA-G1512R0U75	1200	Plane ruled, 750nm blaze	450-1,100
GA-G15083R1U2	830	Plane ruled, 1.2µm blaze	650-1,700
GA-G1506R1U25	600	Plane ruled, 1.25µm blaze	800-2,400
GA-G1506R1U6	600	Plane ruled, 1.6µm blaze	800-2,400

Order Sorting

A filter wheel is located behind the entrance slit of the IDR150 to accommodate a shutter and long pass filters as required for the spectral range of operation. A six position filter wheel, for 25mm diameter filters is fitted as standard. An eight position filter wheel, for 22mm diameter filters is required where more positions are required.

Spectral range	Required OS filter
<400 nm	Under standard conditions- none required
Under purged operation	OS310
400-700nm	OS400
700-1250nm	OS700
1250-2000nm	OS1250
2000-3600nm	OS2000

Slit Configuration

The IDR150 can be configured in the compact, in-line or dual layouts. In the latter case a solenoid-driven programmable swing away mirrors (SAM), controlled by the internal drive electronics, is fitted for port selection.

Slit Type

The dimension of the largest of the entrance/ exit slits defines the bandwidth of the monochromator. Fixed, micrometer variable and motorised variable slits are offered, with a slit height of 20mm. For tuneable light source applications a range of exit slit apertures are available. Please enquire for further information.

Slit type	Features
Fixed slits (FSS)	- Manually controlled - Spring leaf to ensure the correct placement of the slit
Micrometer variable slits (VSS)	- Manually controlled - Bi-lateral slits - Variable from 10µm to 10mm
Motorised variable slits (MVSS)	- PC control via USB - Driven via internal monochromator electronics or external MAC electronics bin - Comprising stepping motor driven bi-lateral slits - Variable from 10µm to 10mm

Further Options

Neutral density filters	A range of metallic neutral density filters, for installation in the IDR150 filter wheel, are available for the purposes of signal attenuation.
Purge port	Installation of purge ports on IDR150 to enable purging of the space within the monochromator for VUV work.