TMc150 Single Monochromator

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The TMc150 150mm focal length single monochromator represents a high performance, reliable solution delivering a wide single-scan measurement over UV-vis-IR region (200nm-50µm).

At just 20x11cm the TMc150 monochromator features an ultra-compact design with a single entrance and exit slit with up to two diffraction gratings, ideal for accommodation into the smallest of spaces available, particularly suitable in OEM applications.

The TMC150 is ideally suited to measurements whereby a lower spectral resolution is required, i.e. as tuneable light source, however is equally at home at the heart of a larger measurement system.

Core benefits

High performance monochromator in compact solution
Compact measurement solutiondeal for OEM application
Designed for measurements whereby a lower spectral resolution is required
Particularly suitable for integration into a larger measurement system

Features

High degree of configurational flexibility
Wide spectral range covered in a single scan
150mm focal length single monochromator
Czerny-Turner configuration
Accommodates up to two diffraction gratings
Single entrance and single exit slit

Optical Layout

Configuration	Symmetrical Czerny Turner
Focal length	150mm
Grating mount	Dual grating turret
Number of gratings	1-2
Grating size	30 x 30mm
Aperture ratio	f/4.2
Number of entrance/ exit ports	1 entrance, 1 exit

Opto-Mechanical

Mechanical resolution drive	0.000072°/ step
Slit type	Fixed, micrometer or motorised variable
Slit width & height	10µm-10mm (W) x 20mm (H)
Filter size	25mm diameter

Optical Performance (quoted for 1200 g/mm gratings)

Spectral range	Within range 200nm-50µm
Linear dispersion	5.4 nm/mm
Wavelength accuracy	± 0.3nm
Wavelength reproducibility	± 0.01nm
Resolution full/reduced slit height	0.3/ 0.2nm
Stray light rejection at 2.5 FWHM	10^-5

Automation

Computer interface	USB 2.0
Software control	BenWin+/SDK

Electrical/ Mechanical

Overall dimensions	137L x 232W x 168H mm
Optical height	110mm
Power supply	External DC PSU

Options

Diffraction gratings	See Configurations Tab
Order sorting filters	See Configurations Tab
Filter wheel	6-position order-sorting filter wheel (filter diameter 23mm)

Monochromator Configurations

Diffraction Gratings

A range of gratings are available depending on the spectral range of consideration, with up to three diffraction gratings mounted to the turret of the TMc150.

Grating	Line density (g/mm)	Grating type & Blaze wavelength	Maximum wavelength range (nm)
GA-G1524R0U25	2400	Plane ruled, 250nm blaze	200-600
GA-G1524H0U25	2400	Plane holographic, 250nm blaze	200-600
GA-G1524H0U3	2400	Plane ruled, 300nm blaze	200-600
GA-G1518H0U25	1800	Plane holographic, 250nm blaze	250-900
GA-G1518R0U4	1800	Plane ruled, 400nm blaze	250-900
GA-G1518R0U5	1800	Plane ruled, 500nm blaze	250-900
GA-G1512H0U25	1200	Plane holographic, 250nm blaze	300-1,200
GA-G1512R0U4	1200	Plane ruled, 400nm blaze	300-1,200
GA-G1512R0U5	1200	Plane ruled, 500nm blaze	300-1,200
GA-G1512R0U75	1200	Plane ruled, 750nm blaze	300-1,200
GA-G1512R0U9	1200	Plane ruled, 900nm blaze	300-1,200
GA-G1512R1U0	1200	Plane ruled, 1µm blaze	300-1,200
GA-G15083R1U2	830	Plane ruled, 1µm blaze	600-1,800
GA-G1506R1U0	600	Plane ruled, 1µm blaze	800-2,500
GA-G1506R1U25	600	Plane ruled, 1.25µm blaze	800-2,500
GA-G1506R1U6	600	Plane ruled, 1.6µm blaze	800-2,500
GA-G1506R1U9	600	Plane ruled, 1.9µm blaze	800-2,500
GA-G1506R2U16	600	Plane ruled, 2.16µm blaze	800-2,500
GA-G1504R1U6	400	Plane ruled, 1.6µm blaze	1,000-3,000
GA-G1503R3U0	300	Plane ruled, 3µm blaze	1,500-5,500
GA-G1503R4U0	300	Plane ruled, 4µm blaze	1,500-5,500
GA-G15015R4U0-AU	150	Plane ruled, 4µm blaze. Gold coated.	3,000-10,000
GA-G15015R6U0-AU	150	Plane ruled, 6µm blaze. Gold coated.	3,000-10,000
GA-G1501R9U0-AU	100	Plane ruled, 9µm blaze. Gold coated.	4,500-16,000
GA-G150075R10U0-AU	75	Plane ruled, 10µm blaze. Gold coated.	6,000-22,000
GA-G150075R12U0-AU	75	Plane ruled, 12µm blaze. Gold coated.	6,000-22,000
GA-G15005R18U0-AU	50	Plane ruled, 18µm blaze. Gold coated.	9,000-30,000
GA-G15005R19U5-AU	50	Plane ruled, 19.5µm blaze. Gold coated.	9,000-30,000

Slits

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

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

Filters

An order sorting filter wheel is located inside the entrance port of the monochromator, fitted with 6 filters selected for the spectral range of use.

When measuring below 400nm, no filters are required as the corresponding wavelength of the subsequent diffraction order is less than 200nm, which is naturally blocked by the atmosphere.

Spectral range	Required OS filter
<400 m	None
400-700nm	OS400
700-1250nm	OS700
1250-2000nm	OS1250
2000-3600nm	OS2000
3.6-6 µm	OS3600
6-10.5 µm	OS6000
10.5-21 µm	OS10500
> 21µm	Please consult.

Further Options

ND/ BP filters	Neutral density filters, used to attenuate optical signal level or band pass filters, to improve monochromator stray light performance, may be mounted in the filter wheel.
Purge ports	Purge ports fitted to monochromator to allow purging with nitrogen to remove atmospheric absorbants which absorb in the UV (<200nm) and IR (Various absorption bands).
Toroidal mirrors	Toroidal mirrors spherical mirrors replaced with toroidal mirrors for imaging applications.
Turret-mirror	A mirror may be fitted on a free location on the turret for the purposes of relating un-diffracted light to the exit port.
418-INT	418 optical chopper mounted behind the entrance slit.
Interchangeable turrets	For applications where very wide spectral range or regional optimisation is required, an interchangeable turret is available allowing the exchange of groups of three diffraction gratings to cover different spectral regions. In this case, the stepping motor in this case drives a platform to which is attached the grating assembly.
Shutter	Solenoid-based shutter for timed exposure applications.

Monochromator Dimensions

TMc150 single monochromator front dimensions — TMc150 monochromator profile - Front profile

TMc150 single monochromator side dimensions — TMc150 monochromator profile - Side profile

TMc150 single monochromator top dimensions — TMc150 monochromator profile - Top profile

Software Control

The TMC150 may be controlled by PC, facilitated via a USB 2.0 interface by Bentham’s Benwin+ spectroradiometer software, responsible for:

Accessing grating filter wheel and slit properties
Identifying grating type and position
Wavelength selection and calibration
Spectral measurements
System calibration
Configuration files syntax

Alternatively, Bentham offers a comprehensive SDK for user-written programs, available across a wide range of platforms (LabVIEW, Matlab, C++, SPCI protocol, etc.).

TMc150 data sheet (657 kB)

TMc150 Single Monochromator

Core benefits

Features

Optical Layout

Opto-Mechanical

Optical Performance (quoted for 1200 g/mm gratings)

Automation

Electrical/ Mechanical

Options

Monochromator Configurations

Diffraction Gratings

Slits

Filters

Further Options

Monochromator Dimensions

Software Control

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