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BTS2048-VL-TEC, CCD spectroradiometer with thermoelectric cooling of the CCD detector

The BTS2048-VL-TEC variant of the BTS2048-VL 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 lie between 2 µs and 4 s. The BTS2048-VL-TEC is therefore ideal for applications with very low light intensities. It is also ideal for luminous flux measurements in which the integrating sphere connected to the device is significantly heated up by high-power lamps.


 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-TEC 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 in the customer’s own software.


Calibration

One essential quality feature of photometric devices is their precise and traceable calibration. The BTS2048-VL-TEC 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 spectroradiometer with thermoelectrically cooled CCD detector

1) BTS2048-VL-TEC 2) BiTec sensor with Si photodiode, CCD array spectrometer 3) TE cooled CCD 4) Filter wheel with OD1, OD2 and shutter54) Precise cosine diffuser 6) Light incident 7) Microprocessor for data procesing and communication 8) USB 2.0 Interface 9) High Speed ethernet Interface 10) Microprocessor CCD sensor control 11) Trigger In/Out 12) Microprocessor photodiode 13) DC voltage supply

Direct attachment of the device to accessory components

Electronic Shutter reduces the measurement time

Ethernet interface reduces the datatransfer time

S-BTS2048 User software interface

Graphical view of the spectrum

CIE 1976 Chromaticity diagram

CRI Bar Plot

General
Short description

High speed TE cooled CCD spectroradiometer with a wide dynamic range for CW and pulsed measurements of irradiance/illuminance, spectrum, luminous color, and color rendering index. Accessories for measurement of other parameters

Main features

Compact device. BiTec detector with back-thinned TE cooled 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 attenuation filters. Input lens with a diffusor window that has a cosine field of view. Automatic PWM synchronization

Range of measurement

Spectral: 0.2 lx to 3E8 lx 280 nm to 1050 nm (min. level by white LED with low saturation). Integral: photometric 360 nm to 830 nm, 0.1 lx Noise signal up to 3E8 lx

Typical applications

CCD spectroradiometer for design applications. Module for integration in test systems for front-end and back-end LED binning

Calibration

Factory calibration. Traceable to international calibration standards

Product
Measurands

Spectral irradiance (W/(m² nm)), irradiance (W/m²), illuminance (lx), spectral radiant intensity (W/(sr nm)), radiant Intensity (W/sr), luminous intensity (cd), 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, TM-30-15, CQS, CIE-170, etc.. Option integrating sphere: in addition spectral flux (W/nm) and luminous flux (lm) Option goniometer: in addition radiant intensity (W/sr) distribution and luminous intensity (cd) distribution

Light Sensor

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

Diffusor, cosine corrected field of view (f2 ≤ 3 %)

Filter wheel

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

BiTec

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)).

Spectral Detector
Calibration uncertainty

Spectral irradiance

(350 - 399) nm: OD0: ± 6 % OD1: ± 7 % OD2: ± 8 %
(400 - 800) nm: OD0: ± 4 % OD1: ± 4 % OD2: ± 4 %
(801 - 1000) nm: OD0: ± 6 % OD1: ± 6 % OD2: ± 6 %
(1001 - 1050) nm: OD0: ± 6 % OD1: ± 7 % OD2: ± 8 %

Spectral irradiance responsivity (350 - 1050) nm

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

2048

Chip

One stage cooled highly sensitive back-thinned CCD chip

ADC

16bit

Peak wavelength

± 0.2 nm

Dominant wavelength

± 0.5 nm           *2

Uncertainty Δx und Δy

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

Repeatability Δx and Δy

± 0.0001

ΔCCT

Standard illuminant A 30K; LED up to +/- 1.5 % depending of the LED spectrum

Band-pass correction

mathematical online band-pass correction is supported

Linearity

completely linearized chip >99.6%

Stray light

2E-4           *3

Base line noise

5 cts     *4

S/N

5000        *5

Dynamic range

>10 Magnitudes

Responsivity range spectral irradiance

(1E-6 - 1E5) W/(m²nm)           *6*7

CRI (color rendering index)

Ra and R1 to R15

typ. measurement time

10 lx        2,5 s           *10
100 lx      250 ms      *10
1000 lx    25 ms        *10

Integral Detector
Filter

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

range

rise time (10 – 90) %

0,1,2

50 µs

3,4,5

65 µs

6,7,8

1.5 ms

Measurement range

Nine (9) measurement ranges with transcendent offset correction

Measurement range

Max measureable illuminance value 3E8lx *7
Noise equivalent illuminance value 1E-1lx

Calibration

Illuminance ± 2,2 %

f1'

≤ 6 % (uncorrected)

≤ 1.5 % (f1' a*(sz(λ)) respectively F*(sz(λ)) corrected by spectral data, done automatically by BTS technology)

Graphs
Spectral responsivity

responsivity BTS2048 VL TEC2

f2

cos BTS2048 VL3

Miscellaneous
Processors

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

Interface

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

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

Software

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

Dimensions

103 mm x 107 mm x 52 mm (Length x Width x Height)

Weight

500g

Mount

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

Temperature stability

CCD Chip: ≤ ± 0.25 °C

Info

*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 and TEC cooling
*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
*10 measurement of a white LED and 20000 counts (signal-dark) saturation

Option: 150mm Integrating Sphere (UMBB-150)
spectral radiant flux responsivity range (spectral measurement)

(5E-9 - 5E2) W/nm

Luminous flux measurement range (integral measurement)

(3E-5 - 1E5) lm

Sphere diameter

150 mm

typ. measurement time

measurement with 20000 cts:

1 lm      80 ms
10 lm    8 ms
100 lm  800 μs

 

optimized measurement time with 5000 cts and noise reduction:

10 lm    2 ms

Calibration

Luminous  flux: ± 4 %

Spectral radiant power:

(350 - 399) nm: OD0: ± 8 % OD1: ± 10 % OD2: ± 10 %
(400 - 800) nm: OD0: ± 4,5 % OD1: ± 4,5 % OD2: ± 4,5 %
(801 - 1000) nm: OD0: ± 6,5 % OD1: ± 6,5 % OD2: ± 6,5 %
(1001 - 1050) nm: OD0: ± 8 % OD1: ± 10 % OD2: ± 10 %

Spectral radiant power responsivity (350 - 1050) nm

Option: 210mm Integrating Sphere (UMBB-210)
spectral radiant flux responsivity range (spectral measurement)

(1E-8 - 1E3) W/nm

Messbereich Lichtstrom (integrale Messung)

(7E-5 - 2E5) lm

Sphere diameter

210 mm

typ. measurement time

measurement with 20000 cts:

1 lm       160 ms
10 lm     16 ms
100 lm   1600 μs

 

optimized measurement time with 5000 cts and noise reduction:

10 lm     4 ms

Calibration

Luminous  flux: ± 4 %

Spectral radiant power:

(350 - 399) nm: OD0: ± 8 % OD1: ± 10 % OD2: ± 10 %
(400 - 800) nm: OD0: ± 4,5 % OD1: ± 4,5 % OD2: ± 4,5 %
(801 - 1000) nm: OD0: ± 6,5 % OD1: ± 6,5 % OD2: ± 6,5 %
(1001 - 1050) nm: OD0: ± 8 % OD1: ± 10 % OD2: ± 10 %

Spectral radiant power responsivity (350 - 1050) nm

Option: 1000mm Integrating Sphere (UMTB-1000-HFT)
spectral radiant flux responsivity range (spectral measurement)

(2E-7 - 2E4) W/nm

Luminous flux measurement range (integral measurement)

(1E-3 - 4E6) lm

Sphere diameter

1000 mm

typ. measurement time

measurement with 20000 cts:

10 lm        450 ms
100 lm      45 ms
1000 lm    4,5 s

 

optimized measurement time with 5000 cts and noise reduction:

10 lm        112 ms

Calibration

Luminous  flux: ± 4 %

Spectral radiant power:

(350 - 399) nm: OD0: ± 8 % OD1: ± 11 % OD2: ± 11 %
(400 - 800) nm: OD0: ± 4,5 % OD1: ± 5 % OD2: ± 5 %
(801 - 1000) nm: OD0: ± 6,5 % OD1: ± 7 % OD2: ± 7 %
(1001 - 1050) nm: OD0: ± 8 % OD1: ± 11 % OD2: ± 11 %

Spectral radiant power responsivity (350 - 1050) nm

Option: Goniometer (GB-GD-360-RB40)
spectral radiant intensity responsivity range (spectral measurement)

(1E-6 - 1E5) W/(sr nm)  ; by 1m measurement distance

Luminous intensity measurement range (integral measurement)

(1E-1 - 3E8) cd ; by 1m measurement distance

Calibration

Luminous intensity: ± 4 %

Spectral Radiant intensity:

(350 - 399) nm: OD0: ± 7 % OD1: ± 8 % OD2: ± 9 %
(400 - 800) nm: OD0: ± 4 % OD1: ± 4 % OD2: ± 4 %
(801 - 1000) nm: OD0: ± 6 % OD1: ± 6 % OD2: ± 6 %
(1001 - 1050) nm: OD0: ± 7 % OD1: ± 8 % OD2: ± 9 %

Spectral radiant intensity responsivity (350 - 1050) nm

Option: ILED-B (CP-ILED-B-IS-1.0-HL)
spectral radiant intensity (ILED-B) responsivity range (spectral measurement)

(5E-8 - 5E3) W/nm

measurment range ILED-B (integral measurement)

(3E-4 - 1E6) cd

Calibration

Luminous intensity ILED-B: ± 4 %

Spectral Radiant intensity ILED-B:

(350 - 399) nm: OD0: ± 7 % OD1: ± 8 % OD2: ± 9 %
(400 - 800) nm: OD0: ± 4 % OD1: ± 4 % OD2: ± 4 %
(801 - 1000) nm: OD0: ± 6 % OD1: ± 6 % OD2: ± 6 %
(1001 - 1050) nm: OD0: ± 7 % OD1: ± 8 % OD2: ± 9 %

Spectral radiant intensity responsivity (350 - 1050) nm

Type Description File-Type Download
Datasheet BTS2048-VL-TEC PDF
Produktname Product Image Description Show product
ISD-100HF-BTS2048-VL System for the luminous flux and light color measurement of individual 2π and 4π light light sources.

Features: Integrating sphere with 100cm diameter, auxiliary lamp and a hemispherical shell for opening and closing, compact spectral light meter with Bi-Tec sensor for acurate measurement of the luminous flux, spectral radiant power, CCT, CRI, chromaticity coordinates, etc.
GB-GD-360-RB40-2-BTS2048-VL System for measurement of the luminous intensity distribution of 2π spot lamps and LEDs.

Features: Goniometer bench with adjustable measurement distance of up to 2000 mm. Light meter for precise measurement of the luminous intensity distribution, spectral data, CCT, CRI, chromaticity coordinates, User software, etc.
TPI21-TH Measurement system for the testing of LEDs and LED assemblies.

Features: CIE S025 compatible, temperature control, Keithley 2400 source, BTS2048-VL spectroradiometer, automatic measurement procedure, intuitive fast DUT contacting, etc.
ISD-15-BTS2048-VL Compact integrating sphere spectroradiometer as monolithic module for LED test system Integration in CW and pulse measurement mode.

Features: Integrating sphere with 15 cm Diameter, auxiliary lamp, high-end CCD-sensor spectralradiometer with Bi-Tec detector for fast and acurate measurement of the luminous flux, spectral radiant power, CCT, CRI,
ISD-25-BTS2048-VL System for the luminous flux and light color measurement of individual 2π LED lamps up to 76.2 mm.

Features: Integrating sphere with 25cm diameter and auxiliary lamp, CCD-sensor spectralradiometer for acurate measurement of the luminous flux, spectral radiant power, CCT, CRI
BTS2048-VL-CP-ILED-B-IS-1.0-HL CCD-sensor spectral radiometer for measurement of CIE 127B averaged LED intensity.

Features: Measurement Adapter with compact integrating sphere for uniform active area. High-end CCD-sensor spectral Radiometer for CW and pulse measurements.
Article-Nr Modell Description Request / Compare
Product
15298687 BTS2048-VL-TEC

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

Re-calibration
15300499 K-BTS2048-VL-I

Recalibration of the BTS2048-VL with calibration certificate

Options
15309109 BTS2048-VL-Z09

Front tube to limit the field of view of spectralradiometer BTS2048-VL to 20 mm or 2.2 mm diameter in 200 mm distance. For blue light hazard applications.

15309268 BTS2048-VL-Z10

Front tube to limit the field of view of spectralradiometer BTS2048-VL to 20 mm or 2.2 mm diameter in 200 mm distance. Tube manufactured of aluminum including black inner coating. Suitable for higher temperatures at measurement location.  For blue light hazard applications.

Software
15298470 S-SDK-BTS2048

Software development kit, software CD with users guide.

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