TE Controlled Pyroelectric Radiometer: STEP-45 and STEP-49 Probes

Temperature controlled, ultra-stable Pyroelectric Radiometer

These innovative instruments represent the ultimate in radiometric measurement stability: temperature control to 0.05° C from 20° to 30° C yields a temperature coefficient of less than 0.01% over the same temperature range. In other words - the Voltage Responsivity (Rv) of the probe is stable to 0.01% when measuring from nW to mW. The STEP probe is calibrated against our unique, Optical TRAP Detector and is accurate to +/- 2.0%. It can also be calibrated with a 1000°K Black Body source for broadband applications. It is an ideal Calibration Standard for your Radiometric or Spectra-radiometric measurements: 0.25 to 15 µm.

The STEP probe is available with a 5 mm or 9 mm diameter detector element, that includes our OB black absorbing coating. Each probe is composed of a low noise detector hybrid, thermistor, TE cooler and heat sink. It has an SM1 threaded front bezel, for easy addition of IR filters, light cones, fiber optic connectors and more. Two ¼-20 threaded, in-line post holes ensure stable optical alignment.

The STEP-45 or STEP-49 includes the STEP-Controller module. The controller provides power and temperate control and the analog detector output.

Datasheets (Acrobat PDF)

STEP-TE 45 and 49 Datasheet

Features:

5 or 9 mm black pyroelectric detector
Stable, temperature controlled performance
Low uncertainty, NIST traceable calibration
Voltage Responsivity stable to 0.01% from 20 to 30° C
Measure power from nW to mW
Calibration accuracy +/- 2.0%
Flat spectral response from 0.25 to 15 µm
Small compact probe/heat sink
Temperature controller, power supply
Dual post mount for stable optical alignment
SM1 threaded front bezel

STEP-Controller Features:

Power On/Off switch
Power ON light
Cooler Drive On/Off switch
Thermistor Open light / Short light
Battery eliminator plug
LEMO Detector Input connector
BNC Detector Output connector

STEP-45/STEP-49 Accessories:

Interchangeable IR Windows: BW, SW, SiW, GW, ZW
Fiber Optic Connectors: SM1SMA, SM1FC, SM1ST
SM1A7 Alignment Cross Hair
SM1A8 IR Alignment Aide
SDC 5000 Digital Optical Chopper

STEP 45 and STEP 49

.	STEP-45	STEP-49

Detector Size, mm	5	9
Voltage Responsivity 10⁴V/W@0.63µm, 5 Hz	2.0 peak (Scope), 0.9 rms (Lock-In)	2.0 peak (Scope), 0.9 rms (Lock-In)
Noise Equivalent Power 10^-9W/(Hz)^1/2	< 5.0 (Scope), <11.0 (Lock-In)	< 5.0 (Scope), <11.0 (Lock-In)
Detectivity, 10⁸cm(Hz)^1/2	0.88 (Scope), 0.40 (Lock-In)	2.85 (Scope), 1.29 (Lock-In)
Thermal 3dB Frequency (Hz)	0.50	0.25
Temperature Stability, 20 to 30° C	+/- 0.05° C	+/- 0.05° C
Voltage Response Stability, 20 to 30° C	+/- 0.01%	+/- 0.01%
Calibration Accuracy, 20 to 30° C @0.63µm (calibrated against our Primary Optical TRAP standard using a Lock-In Amp)	+/- 2.0% (Lock-In Only)	+/- 2.0% (Lock-In Only)
Price in USD	CALL or e-mail	CALL or e-mail

Mechanical Specs: STEP-Controller

Mechanical Specs: STEP-Probe

Note: 11 mm diameter front aperture is removed. 0.24 inch aperture is at 0.18 inches in front of the "detector element plane."

Relative Spectral Absorption ob OB Coating