DETECTORS

Photo Detectors

Input Optics

Filters

Filters and input optics can dramatically alter a detector's spectral and spatial responsivity.

NOTE: The dynamic ranges given for each detector apply for use with the IL1700 (SED type).

To view the specifications for any detector, click on the detector name.

	SED(SEL)033 SED(SEL)100		SED(SEL)033 SED(SEL)001U		SED(SEL)033 SCD(SCL)110& SCD(SCL)144
	SED(SEL)033 XRD(XRL)140 & XRD(XRL)340		SED(SEL)033 SPD(SPL)024 & SPD(SPL)025		SED(SEL)033 SL021
	SED(SEL)033 SED(SEL)185		SED(SEL)033 SED(SEL)240 & SED(SEL)220		SED(SEL)033 SED(SEL)007
	SED(SEL)033 SED(SEL)005		SED(SEL)033 SED(SEL)623 & SED(SEL)624 & SED(SEL)625		SED(SEL)033 SSD(SSL)001
	SED(SEL)033 XRL140DSB		SED(SEL)033 XRL140T254		SED(SEL)033 SED(SEL)033 /F/HMR/W
	SED(SEL)033 XRDXRL050

HIGH GAIN DETECTORS
SHD033 High Gain Detector Range: 3 x 10-13 to 4.5 x 10-5 W/cm2 Spectrum: 200 to 1050 nm, 750 peak Size: 69 mm x 42 mm dia. SHD240 High Gain Solar-Blind Detector Range: 1 x 10-12 to 2 x 10-7 W/cm2 Spectrum: 185 to 320 nm, 240 peak Size: 101 mm x 42 mm dia.	The SHD033 matches the sensitivity of a PMT using solid state amplification of a silicon photodiode. The proprietary preamp is unique in that it preamplifies the current-chopped junction charge of the cell, providing an 82 dB linear response. Built-in temperature control and leakage shielding minimize noise and dark current. The special Silicon cell has a broad spectral range with excellent sensitivity in the near IR, recovers rapidly from overload (such as direct sunlight) without damage, and maintains its calibration integrity over time. Since the complex preamplification circuitry is located within the actual detector head, noise is held to a minimum. The remote circuitry requires input voltages automatically provided by the IL1700 and IL1800 Research Radiometers (not available for use with the IL1400A). The SHD240 uses the same preamplification in conjunction with a Cs-Te solar-blind vacuum phototube with a UV glass window. This high stability device maintains ± 1% sensitivity for ten years. The flat 8 mm diameter cathode provides a large, well defined receiving surface for accurate geometry calculations. The SHD240 contains temperature regulation, for operation from -80°C to +50°C. Both of the SHD detectors have been designed to operate with the IL1820 Lock-In Radiometer System, for 2 Hz chopped measurement and phased zeroing. This results in a 100:1 improvement in signal to noise.
PM271C Photomultiplier Detector: Spectrum: 200 to 675 nm, 390 peak, S-5 Range: 6 x 10-14 to 6 x 10-7 W/cm2 Size: 161 x 50 x 38 mm PM271D Photomultiplier Detector: Spectrum: 200 to 850 nm, 420 peak, S-20 Range: 3 x 10-14 to 3 x 10-7 W/cm2 Size: 161 x 50 x 38 mm	PM271 SERIES PHOTOMULTIPLIERS: Photomultipliers provide high internal current gain by combining the external photoelectric effect (semiconductor photodiodes use the internal photoelectric effect) with low noise secondary electron multiplication. A high voltage regulated supply, such as the IL760D Photomultiplier Power Supply, is required to provide the appropriate cathode, dynode, and anode voltages. The response time for PMT's is typically very fast (<10 nS), and is a function of the dynode voltage. Photomultipliers typically offer a six decade dynamic range with excellent linearity over most of that range. Although PMT's are relatively immune to thermal "Johnson" noise, the noise equivalent power is limited by dark current, which can be reduced by cooling the photomultiplier. In addition, photomultipliers require more frequent recalibration, as they do not exhibit the long term stability inherent to solid state devices.
Detectors The detector itself exhibits a pronounced spectral response. Silicon photodiodes exhibit peak responsivity in the near-IR, decreasing linearly through the visible into the UV. Vacuum photodiodes provide excellent UV response with long wave rejection. "Solar-blind" vacuum photodiodes peak in the deep UV while blocking out both visible and IR light. InGaAs photodiodes offer excellent sensitivity to near IR while blocking long wave Infrared. Thermopiles exhibit sensitivity across the entire spectrum, with an extremely flat response to Infrared from 700 nm to 60 ?? Each detector type has carved a distinct niche in radiometry, providing desirable properties over a particular bandwidth. The graph below shows the response of some unfiltered detector types. The X axis extends from 150 to 2000 nm. The Y axis extends (logarithmically) from 10-4 to 102 A*cm2/watt.      Detector Types (unfiltered)        SED(SEL)033 Type: UV Enhanced Silicon Photodiode, Quartz window, 33 mm2 area. Spectrum: 200 to 1100 nm, 950 nm peak Range: 3 x 10-12 to 1 x 10-2 W/cm2 Size: 20 mm x 42 mm diameter      SED(SEL)240 and SED(SEL)220 Type: Solar Blind Vacuum Photodiode (fused silica window available as SED220) Spectrum: 185 to 320 nm, 240 peak (SED220: 160 to 320 nm, 220 peak) Range: 5 x 10-11 to 7 x 10-5 W/cm2 Size: 53 mm x 42 mm diameter    XRD(XRL)140 and XRD(XRL)340 Type: Silicon Photodiode with built-in UV filters. Spectrum: A: 320 to 475 nm, B: 326 to 401 nm Range: 2 x 10-9 to 1 W/cm2 (XR340 is 1/10 as sensitive) Size: 13 mm x 42 mm diameter      SED(SEL)005 Type: GaAsP Photodiode, Quartz window, 5 mm2 active area. Spectrum: 250 to 675 nm, 610 nm peak Range: 1 x 10-10 to 2 x 10-1 W/cm2 Size: 20 mm x 42 mm diameter    SPD(SPL)024F and SPD(SPL)024Y Integrating Sphere Pen Probe Type: Silicon Photodiode with filters and sphere built into dedicated probe. Spectrum: Y Photopic or F Flat Range: 1 x 10-9 to 2.0 W/cm2 Size: 121 mm x 19 mm diameter    SPD(SPL)025F and SPD(SPL)025Y Radiance Pen Probe Type: Silicon Photodiode with filters and radiance optics built into dedicated probe. Spectrum: Y Photopic or F Flat Range: 1 x 10-9 to 2.0 W/cm2/sr Size: 121 mm x 19 mm diameter    SED(SEL)623 and SED(SEL)624 Type: Multi-Junction Thermopile, 4 mm2, Quartz window (KBr in SED624). Spectrum: 200 to 4200 nm, flat above 700 nm (SED624: 0.2 to 40 ?? Range: 2 x 10-5 to 1 x 10-1 W/cm2 Size: 61 mm x 42 mm diameter    SCD(SCL)110 and SCD(SCL)144 Type: Silicon Photodiode with filters and diffusers built into dedicated probe. Spectrum: Y Photopic (SCD110) or Bilirubin Blue (SCD144) Range: 5 x 10-3 to 1 x 10+6 lux (SCD144: 1 x 10-9 to 2.5 W/cm2 Size: 112 x 18 x 18 mm    SSD(SSL)001 SuperSlim Probe Type: UV Enhanced Silicon Photodiode, 0.64 mm2 area, built in UV filter Spectrum: A: 260 to 400 nm, 370 peak Range: 3.9 x 10-9 to 1.0 W/cm2 Size: 29 x 38 x 2 mm diameter    SED(SEL)185 Type: Au single metal photocathode 8 mm dia area, quartz window Spectrum: 160 to 240 nm, 185 peak Range: 3 x 10-8 to 4 x 10-2 W/cm2 Size: 53 mm x 42 mm diameter    SED(SEL)007 Type: InGaAs with Quartz window. Spectrum: 850 to 1700 nm, flat Range: 1.5 x 10-11 to 3 x 10-2 W/cm2 Size: 20 mm x 42 mm diameter Graph of Responsivity vs. Wavelength for Luckiesh Germicidal, ACGIH Actinic, 2 Photoresists, ACGIH Blue Hazard, CIE Scotopic Vision, CIE Photopic Standard Observer, and Silicon Photodiode.

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TREC 1600

IL290/390C

IL1400PHOTOMETER

IL1700 RADIOMETER

DETECTORS

FILTERS

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