• IDR150 monochromator with integrated picoammeter and HV supply

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


  • 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


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

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.

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