BTS2048-UV-S-WP

CCD based spectroradiometer with large dynamic for CW-, Datalogger- and Single measurements of spectral irradiance and derivative quantities (spectrum, erythema, ICNIRP, etc.) in the UV spectral region for outdoor use.

Compact measurement device. Bi-Tec detector with back-thinned CCD-diodearray spectrometer (0.7 nm optical bandwidth, electronic Shutter, high dynamic) and SiC-Fotodiode. High stray light reduction. Filter wheel with aperture and optical filters. Entrance optic with diffuser which is cosine FOV. Weatherproof housing for outdoor use. Ethernet and USB interface.

Spectral: 3E-5 W/(m²nm) to 3E4 W/(m²nm) @325nm. Responsivity from 190 nm to 430 nm.

Integral: 2E5 W/m² to noise equivalent level by 5E-3 W/m²

Diodearray spectrometer for scientific outdoor measurement tasks. Erythema, ICNIRP, solar-cells, etc.

Factory calibrations traceable to PTB calibration standards.

Spectral irradiance (W/(m² nm)), irradiance (W/m²), peak wavelength, center wavelength, centroid wavelength, Erythema, ICNIRP.

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

8 positions (open, closed, optical filters). Use for remote dark current measurement and stray light reduction.

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*(s_z(λ)) respectively F*(s_z(λ)).

Spectral irradiance

Spectral irradiance responsivity (200 - 430) nm

2 μs - 60 s        *1

(190 - 430) nm

0.8 nm

~0.13 nm/Pixel

2048

Highly sensitive back-thinned CCD chip, one stage cooled (1TEC)

16bit (25 ns instruction cycle time)

± 0.05 nm

mathematical online band-pass correction is supported

completely linearized chip >99.6%

Out of Bound method < 1E-4           *3

Bandpass method < 1E-5           *3

5 cts     *4

5000        *5

>9 Magnitudes

(3E-5 - 3E4) W/(m²nm) @325nm        *6*7

W/m² of a Halogen lampe from (250 - 400) nm

Standard measurement mode: 200 nm to 430 nm

Out of Range stray light corrected measurement mode (OoR SLC): 200 nm to 430 nm

Stray light corrected bandpass mode for solar measurements (solar BP SLC): 285 nm to 420 nm

Universal stray light corrected bandpass measurement mode (BP SLC): 245 nm to 420 nm

Mathematical adjustment of the responsivity to a rectangular function from 220 nm to 360 nm (SMCF on-line correction to the radiometric function with the measured spectral data).*

* The spectral responsitivity of the diode does not correspond to a rectangular function (not possible with optical filters). When measuring light sources with a spectrum that deviates from the calibration spectrum of the integral detector (UV LED, peak at 405 nm), the measurement result is corrected using SMCF. The uncertainty of this correction depends on the quality of the measured spectrum (noise) and the size of the correction factor (spectral range).

(0.1 - 6000) ms

seven (7) measurement ranges with transcendent offset correction

Irradiance ± 6 %               *¹⁰

(5E-3  -  2E5) W/m²       *¹¹

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

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

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

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

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.

With power supply: (90-295) V 150 W

Diameter: 160 mm

Height: 222 mm

(see detailed drawing)

2.85 kg

3x M6 screw threads

Storage: (-10 to 50) °C

Operation: (-25 to 50) °C           *9

Spectroradiometer unit: IP67

Outdoor housing itself: IPx5

inside WP housing (electronics): ≤ ± 1 °C

CCD Chip: ≤ ± 0.25 °C

*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 with and deep blue LED peak. The dynamic which can be resolved within one measurement depends on the number of averages and the light source. Typical for a solar measurement is a dynamic of 4.5 orders of magnitude resolution within one measurement.

*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 requires for temperature stabilization approx. 25min (power supply is needed for outdoor use). 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 With a(Z) correction by a Deuterium lamp

*11 By a spectral power distribution of a deuterium lamp, maximum radiation only allowed for a short time so as to avoid thermal damage