The KMPV series detectors are high speed [wide bandwidth] HgCdTe photodiodes with integral amplifiers in pour filled Dewars. The KLD series detectors are moderate speed [2MHz bandwidth] HgCdTe photodiodes with integral amplifiers in pour filled Dewars. Both KMPV series and KLD series are available to cover either the 2 to 12 spectral range, or the 2 to 9 range. Various infrared window materials are available to optimize performance in a desired spectral range. The standard window for the KMPV series is ZnSe with a 2 to 12um anti-reflection coating. The standard window for the KLD series is BaF2. The KMPV and KLD dimensions are identical.
The KISDP series detectors are high speed/wide bandwidth InSb photodiodes with amplifiers in pour filled Dewars. They cover the 1 to 5 um spectral range. The standard window is sapphire. The most common size detector is 1mm diameter.
For KMPV and KISDP series the detector size determines the upper limit of frequency response. The detector response time is RC time constant limited -- junction capacitance and series resistance and load resistance. Smaller detectors will be faster.
Connect the detectors wires with solder. Do not use "clips" where one lead may come off and cause single supply on condition which may degrade some components.
Liquefied nitrogen gas is extremely cold and can produce an effect on the skin similar to a burn.
The geyser effect: the physical properties of the Dewar materials causes an unusual geyser effect if the Dewars are filled quickly. This is the result sudden decrease in the specific heat of the components in the well at low temperatures, causing a sudden release of heat to the liquid nitrogen. This does the Dewar no harm but the liquid erupting could injure the person filling the Dewar. Partially fill the Dewar until geyser effect observed, then complete the filling.
The detector/Dewar assembly is FRAGILE. DO NOT DROP. The shock could rupture seals and cause loss of vacuum.
All model require dual power supplies. These can be linear, switched power supplies, or batteries.
The normal operating voltage is +15V and -15V and a ground/return connection. The batteries achieve the lowest noise, but are not necessary. The front end of the amplifiers are voltage regulated and have a very high power supply noise rejection ratio. The KMPV and KISDP series with single output draw 35mA, and with dual outputs draw 55mA. The KLD series draws 20mA with single output, and 38mA with dual outputs.
The detectors may also be operated with +12V -12V power supplies. On detectors with a DC output, this requires the readjustment of the DC level to zero for the ambient background, ,when the detector is operating. There is a small hole above the DC output connector with a 15 turn potentiometer, which can be accessed with a small screwdriver.
Kolmar Technologies, Inc.
Test Data Sheet 18 DEC 2004
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Infrared detector:
Detector Model: KLD-1-J1/DC
Detector Serial No. 3888-11
Lot: MCT PV 3385-10
________________________________________________________________________
Description:
Window: ZNSE 10.6UM ARC
Distance detector/front Window nominal 1.02 CM
Field of View [FOV] 60 degrees full angle nom.
Connector(s) BNC
TEMP SENSOR: NA
TRANSIMPEDANCE AMP. 10000 DC.CH NA AC.CH
Dewar type J SIDELOOKING SN 04-4737
LN2 hold time 12 nominal
Detector Temperature 77 K
Detector data: Units
Size: 1 mm DIA.
Active area: 7.85E-03 cm^2
Responsivity(DETECTOR): 6.78 Amp/Watt
Quantum efficiency PEAK: 0.80 @ BIAS V 0.06 window included
Peak wavelength: 10.53 um
Cut off wavelength: 11.45 um
Resistance (@V=0): 200 Ohm
RoA : 1.57 Ohm-cm^2
BACK IMPEDANCE 3000 0.063 @ V Ohm
R series 5 max Ohm
risetime 1.86E-07 sec
Bandwidth(-3db) 2 NOM MHz
D*[@PEAK,@50kHz 7.86E+10 Jones
RESPONSIVITY 6.78E+04 DC OUTPUT V/W
RESPONSIVITY NA AC OUTPUT V/W
Pin Configuration:
Connect power supply to detectors pins or socket. Connect the signal output coaxial cables to the BNC or SMA connector[s] output connectors.
Cool detector with liquid nitrogen using the funnel fill tube. Keep filling the funnel in cone increments. Repeat until reservoir is full [spill over]. Cool down time is about 5 to 10 minutes. The detector is at working temperature once the rapid boil off venting has stopped. Place the fill port plug in the fill port. Turn on the power. Connect the DC channel output to an oscilloscope and check the DC output level. This has been set to zero with 295K background temperature in the detector's field of view. Confirm that this is still true. If the detector is still cooling, this voltage may be decreasing. Wait until it has stabilized. If this level is not at zero Volts, it may be adjusted by turning the 25 turn potentiometer in the hole above the DC output connector. You are good to go.
We like to think our products are perfect so first look for a cause elsewhere. Is there power to the detector? Are both positive and negative sides connected? Is the return connected? Is the amplifier drawing the correct current -- 35mA, 20mA, or 60mA depending on the specification? What is the signal source and is it on? What is the signal power -- is it too low to see in the peak-peak 5mV broadband noise? or is it too high and the amplifier is saturated at +12V DC output? And the obvious, is the detector still cold?
A quick check with a DC coupled detector; look at the output on a scope. It should be near zero volts with white noise 5mV peak to peak. Hold you hand in the field of view and the DC level should go up. If nothing happens, or if the DC level is at -12V or +12V, contact technical support.
Assuming the source has not changed and the signal has decreased, this may be a detector problem. Contact technical support.
Excess noise my be caused by the environment, poor ground connections, high background photon flux, or ground loops. Power supply noise should not be a problem because of the high noise rejection built into the amplifier.
The KMPV, KLD and KISDP series detectors should provide years of trouble free use with proper care and handling. However, after several years of operation, the Dewar may require a vacuum refreshing. Indications that service is needed are shorter liquid nitrogen [LN2] hold time, or condensation on the Dewar.
Contact technical support to make arrangements to have this procedure performed on the Dewar. Or, this can be done by the owner, if a high vacuum pump system is available. The vacuum refresh procedure requires the VO-1 or VO-2 valve operator [see accessories listed at www.kolmartech.com/prod_lst.htm] and the procedure listed below.
| Size(mmxmm) | 1.0, 0.5, 0.25, 0.2, 0.15, 0.1, 0.05 | |
| Quantum Efficiency | >50% | |
| Wavelength cutoff | >11.5 um | |
| Bandwidth | DC to 20MHz 100Hz to 20MHz | |
| FOV | 60 degrees full angle | |
| D*(peak,10kHz,60,1) | 4x1010 Jones nom. | |
| Responsivity (output) | > 40,000 V/Watt | |
| Power | +12V,-12V or +15V,-15V 55mA |
| Size(mmxmm) | 2.0, 1.0, 0.5 | |
| Quantum Efficiency | >75% | |
| Wavelength cutoff | 5.4 um | |
| Bandwidth | DC to 20MHz 100Hz to 20MHz | |
| FOV | 60 degrees full angle | |
| D*(peak,10kHz,60,1) | 1.5 X 1011 Jones nom. | |
| Responsivity (output) | > 40,000 V/Watt | |
| Power | +12V,-12V or +15V,-15V |
|
Model * |
Wavelength (m m)Peak Cutoff |
Size (mm) |
Bandwidth (Hz)
|
D* (60FOV)(Jones ,typ)
|
Responsivity (Volts/mWatt) |
|
KLD-1-J1-3/11 |
10.5 >11.5 |
1 x 1 |
2M |
4E10 |
>40 |
|
KLD-1-J1-3/9 |
7.6 >8.5 |
1 x 1 |
2M |
8E10 |
>32 |
|
KLD-0.5-J1-3/10/DC |
9.5 >10.5 |
0.5x0.5 |
DC - 5M |
4E10 |
>40 |
|
KLD-2-J1-3/11/DC |
10.5 >11.5 |
2 x 2 |
DC - 1M |
4E10 |
>40 |
*Key:model-size-package-window/wavelength
Now all models KMPV-xx-Jx, KMPV-xx-Jx, KISDP-xx-Jx, KLD-xx-Jx [HgCdTe and InSb photodiodes with integral amplifiers] can have an automatic the on/off feature. The power to the amplifiers and detector is turned on when the temperature approaches the operating point [77K]. When liquid nitrogen is depleted, power is turned off at temperatures above 100K.
The power should always be turned off when the detector is not cooled. The automatic on/off feature prevents problems by avoiding an accidental power on and no liquid nitrogen condition.
KTI warrants that equipment shall be free from defects in materials and workmanship for a period of one (1) year from the date of shipment from KTI. Liability under this warranty is limited to replacing, repairing, or giving credit for the purchase price of any equipment returned and shipped prepaid to KTI within one (1) year of delivery to the original Purchaser, provided prior authorization for such return has been given by an authorized representative of KTI. In-warranty repaired or replaced equipment is warranted only for the remaining unexpired portion of the original warranty period applicable to the repaired or replaced equipment.
This warranty shall not apply to equipment or components which our inspection shall disclose to have become defective or unworkable due to abuse, mishandling, misuse, accidental alteration, negligence, improper installation, or other causes beyond our control. Detectors damaged by lasers are not covered by warranty, but will be repaired for a nominal fee. This type of laser damage includes current damage to contacts when the detector is illuminated with high laser illumination and/or under high bias conditions.
THE FOREGOING WARRANTY IS IN LIEU OF ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.