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BTS2048-VL-TEC-F, CCD spectroradiometer with thermoelectric cooling of the CCD detector and light guide input

The BTS2048-VL-TEC-F variant of the BTS2048-VL-F incorporates thermoelectric cooling of its CCD detector. The device meets all the requirements of a high-end diode array spectroradiometer and is favourably priced despite its cutting-edge design.

Thermoelectric cooling of the CCD detector minimizes the dark noise signal and enables integration times ranging from 2 µs to 60 s whereas those of the BTS2048-VL-F lie between 2 µs and 4 s. The BTS2048-VL-TEC-F is therefore ideal for applications with very low light intensities.

User software and developer software

The standard S-BTS2048 user software has a customizable user interface and a large number of display and function modules which can be activated when configuring the BTS2048-VL-F with the respective accessory components from Gigahertz-Optik GmbH. The S-SDK-BTS2048 developer software is offered for the integration of the BTS2048-VL-TEC-F in the customer’s own software.


One essential quality feature of photometric devices is their precise and traceable calibration. The BTS2048-VL-TEC-F is calibrated by Gigahertz-Optik’s calibration laboratory that was accredited by DAkkS (D-K-15047-01-00) for the spectral responsivity and spectral irradiance according to ISO/IEC 17025. The calibration also included the corresponding accessory components. Every device is delivered with its respective calibration certificate.

The BTS2048-VL-TEC-F TE cooled CCD spectroradiometer for use with light guide
1) BTS2048-VL-TEC-F 2) BiTec sensor with Si photodiode, CCD array spectrometer 3) TE cooled CCD 4) Filter wheel with OD1, OD2 and shutter 5) Light-guide mount 6) Light-guide Adapter 7) Light incident 8) Microprocessor for data procesing and communication 9) USB 2.0 Interface 10) High Speed ethernet Interface 11) Microprocessor CCD sensor control 12) Trigger In/Out 13) Microprocessor photodiode 13) DC voltage supply
CP-F16-M-10 light guide adapter
S-BTS2048 User software interface
Graphical view of the spectrum
CIE 1976 Chromaticity diagram
CRI Bar Plot
Short description

Tec-cooled CCD spectroradiometer with light guide input for decoupling of the light meter from the application. Wide dynamic range for CW and short-term measurements. Measurement parameters based on the optional accessories: spectrum, luminous color, and color rendering index

Main features

Compact device. BiTec detector with back-thinned CCD (2048 pixels, 2 nm optical resolution, electronic shutter) and Si-photodiode with V(lambda) filter. Optical bandwidth correction (CIE214). Filter wheel with shutter and two attenuation filters. Input lens for light guide

Measurement range

Depending on the accessories. Spectral range 280 nm to 1050 nm

typical applications

Separate setup of the CCD spectroradiometer and measurement optics. Measurement device with light guide for integration in test systems for front-end and back-end LED binning


Factory calibration. Traceable to international calibration standards

typical applications

Lightmeter with fiber mount for radiometric, photometric and light color measurements

Measured Quantity

With light guide and diffusore entrance optics spectral irradiance (W/(m² nm)), illuminance (lx), dominant wavelength, peak wavelength, center wavelength, centroid wavelength, x, y, u´, v´, X,Y,Z, delta uv, color temperature, color rendering index (CRI) Ra, R1-R15. With integrating sphere: in addition spectral flux (W/nm) and luminous flux (lm)


Accuracy class B according to DIN 5032 and CIE No. 69
Accuracy class A for f1`, u, f3 and f4 according to DIN 5032 and CIE No. 69

Input optics

Light guide adapter

Filter wheel

4 positions (open, closed, OD1, OD2). Use for remote dark current measurement and dynamic range extension.


Parallel measurement with diode and array is possible, thereby linearity correction of the array through the diode and online correction of the spectral mismatch of the diode through a*(sz(λ)) respectively F*(sz(λ)).


Depending on the light guide

Spectral Detector
Integration Time

2 μs - 60 s        *1

spectral range

(280 -1050) nm

Optical Bandwidth

2 nm

Pixel resolution

~0.4 nm/Pixel

Number of pixels



Highly sensitive back-thinned CCD chip


16bit (25 ns instruction cycle time)

Peak wavelength

±0.2 nm

Dominant wavelength

±0.5 nm           *2

Δy Δx uncertainty

±0.0015 (Standard illuminant A)
±0.0020 (common LED)

Repeatability Δx and Δy



Standard illuminant A 30K; LED up to ± 1.5 % depending of the LED spectrum

Band-pass correction

mathematical online band-pass correction is supported


completely linearized chip >99.6%

Stray Light

2E-4           *3

Base line noise

5 cts     *4


5000        *5

dynamic range

>10 Magnitudes

CRI (color rendering index)

Ra and R1 to R15

Integral Detector

Spectral responsivity with fine CIE photometric matching. Online correction of the photometric matching through spectral measurement data (spectral missmatch factor correction).

Measurement time

20 µs  - 6000 ms



rise time (10 – 90) %


50 µs


65 µs


1.5 ms

Measurement range

seven (7) measurement ranges with transcendent offset correction

f1' (spectral mismatch)

≤6% (uncorrected)

≤3% (f1' a*(sz(λ)) respectively F*(sz(λ)) corrected by spectral data, done automatically by BTS technology)


32bit for device control,16bit for CCD array control, 8bit for photodiode control


USB V2.0, Ethernet (LAN UDP protocol), RS232, RS485

Data transfer

Standard for 2048 float array values via ethernet 7ms, via USB 2.0 140 ms

Input Interfaces

2x (0 - 25) VDC, 1x optocoupler isolated 5 V / 5 mA

Output Interfaces

2x open collector, max. 25 V, max. 500 mA


Trigger input incorporated (different options, rising/falling edge, delayed, etc.)


User software S-BTS2048
Optional software development kit S-SDK-BTS2048 for user software set-ups based on .dll‘s in C, C++,C# or in LabView.

Power Supply

With power supply: DC Input 5V (±10 %) at 700 mA
With USB bus (500mA) *8


103 mm x 107 mm x 52 mm (Length x Width x Height) + Fiber Adapter




Tripod and M6 screw threads

Front adapter UMPA-1.0-HL for use with integrating sphere port-frame UMPF-1.0-HL

temperature range

Storage: (-10 to 50) °C

Operation: (10 to 30) °C           *9


*1 It is recommended to perform a new dark signal measurement for every change in the integration time
*2 typical value, the uncertainty of the dominant wavelength depends on the spectral distribution of the LED
*3 typical value, measured 100nm left of the peak of a cold white broadband LED
*4 *5 typical value measured without averaging for a 4ms measurement time and full scale control of the array. Averaging results in quadratic rise of the S/N
i.e. quadratic fall of the base noise e.g. averaging to a factor 100 improves the S/N by a factor 10
*6 Minimum 500/1 S/N. Maximum at full scale control.
*7 Irradiation only allowed for a short time so as to avoid thermal damage
*8 during USB connection, not all functions are available due to the limited current supply e.g. no Ethernet
*9 Device required for temperature stabilization in approx. 25min. In measurement is performed in the warm-up phase, or if measurements are performed
under varying temperatures, dark signal measurement is required for each measurement


temperature range

CCD Chip: ≤ ± 0.25 °C

Option: CP-CD-IL-10 or CP-CD-90-10 (Irradiance)
spectral irradiance responsivity range (spectral measurement)

(4E-6 - 3E5) W/(m²nm)

(Note: typically CP-CD-90-10 is 10% insensitive compared to this stated numbers of CP-CD-IL-10)

Illuminance measurement range (integral measurement)

(5E-1 - 1E9) lx

(Note: typically CP-CD-90-10 is 10% insensitive compared to this stated numbers of CP-CD-IL-10)

Type Description File-Type Download
Datasheet BTS2048-VL-TEC-F PDF
BTS2048-Series BTS2048 'Not just another spectrometer' brochure PDF
Produktname Product Image Description Show product
S-SDK-BTS2048 Software Development Kit for BTS2048 variants.
Article-Nr Modell Description Request / Compare
15298738 BTS2048-VL-TEC-F

Measuring device, hard cover box, users guide, S-BTS2048 software, calibration certificate.

15305452 CP-F16-M-10

Adapter for LG-1.5-10 light guides to lightmeters with F16-F mount.

15307119 CP-LG-1.5-10

Flexible light-guide with 1.5 mm Diameter fiber, 10mm diameter mounts and 2 m length.

15305454 CP-CD-IL-10

Diffusor window adapter for LG-1.5-10 light-guides. 37 mm housing diameter.

15305453 CP-CD-90-10

90° diffusor window adapter for LG-1.5-10 light-guides. 37 mm housing diameter.

15298470 S-SDK-BTS2048

Software development kit with users guide.

15307925 S-T-RECAL-BTS2048

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