Low Noise Lock In Power Sensors
300fW to 100mW
Features
• Chopper and lock in amplifier for lowest noise and drift
• Wavelength range from UV to deep IR including Terahertz
• RM9 pyro is not sensitive to background radiation
The RM9 series Radiometers use a pyroelectric or photodiode sensor in conjunction with chopped CW or quasi CW radiation, using a digitally synthesized lock-in amplifier to reduce external noise to a minimum. The signal is passed through the 18Hz chopper and the chopped signal is detected by the sensor. All signals not at this 18Hz frequency are suppressed. The output of the sensor is displayed on a standard Ophir meter or PC interface. The chopper may be placed at any convenient location but preferably close to the signal source so as to eliminate interference from all unchopped radiation.
Specifications
Model
RM9
RM9-THz
RM9-PD
Use
Low level signals
Low level Terahertz
Very low level signals
Detector Type
Pyroelectric
Pyro with THz absorber
Si Photodiode
Spectral Range
0.15 - 12µm (a)
0.1 – 30THz (g)
0.2 - 1.1µm (b)
Aperture mm
Ø8mm
Ø8mm
Ø8mm
Surface Reflectivity % approx.
50
40 - 70
50
Power Range (c)
100nW – 100mW
100nW – 100mW
300fW – 300nW
Power Scales
100mW to 3µW
100mW to 3µW
300nW to 3pW
Power Noise Level (d)
~30nW
~20nW
30fW
Minimum Frequency for Pulsed Sources
200Hz
200Hz
200Hz
Thermal Drift (20min) (e)
~30nW
~15nW
N.A.
Power Accuracy
±5% (a)
±10% (g)
±5% (b)
Damage Threshold W/cm2
5
5
5
Response Time with Meter (0-95%) s
3.5s
3.5s
3.6s
Linearity with Power
±2%
±2%
±2.5%
Connections:
1. 1.5 meter cable hard wired to interface module.
2. BNC connector on module for connection to chopper (2 meter BNC to BNC cable included). Perform zeroing with BNC cable removed.
3. 0.5 meter cable from module terminated in DB15 connector.
Cooling
convection
convection
convection
Weight kg
0.37
0.37
0.37
Compliance
CE, China RoHS
CE, China RoHS
CE, China RoHS
Version
Part Number for RM9 Series with RMC1 Chopper (f)
7Y70669
7Y70678
7Y70672
Part Number for RM9 Series Sensors
7Z02952
7Z02956
7Z02953
Notes:(a) At calibrated wavelengths 500 – 1100nm. At other wavelengths, there is an additional error as follows: <500nm add ±8%, 1100 – 3000nm add ±5%, 10.6µm add ±15%
Notes: (b) At calibrated wavelengths 200 – 1100nm. For <700nm add ±2% additional error
Notes: (c) For LaserStar, Pulsar, USBI, Quasar and Nova/Orion, upper limit is 1mW for RM9/RM9-THz and 90nW for RM9-PD. For these models, accuracy may also be less than values given above
Notes: (d) Averaged over 10s
Notes: (e) In a typical laboratory environment
Notes: (f) The RMC1 or another chopper unit that can be set to 18Hz is required for operation of the RM9 series sensors
Notes: (g) The sensor is calibrated for 0.7, 1.5, 2.5, 4 and 10THz..Stated accuracy is for frequencies or interpolated frequencies in the range 0.7 – 5THz. For 5 – 10THz, the calibration uncertainty is 15% and for frequencies outside that range, approximate readings can be calculated from the graph but no specified accuracy is given.
Model
RMC1 Chopper
Use
Chopper for RM9 Series
Aperture
Ø22mm
Chopping Frequency (a)
18Hz
Power Consumption
85mA
Connections:
1. BNC to interface module
2. 12V wall cube power supply (included)
3. Mini USB connector (factory use only)
Notes: (a) not adjustable by user.
商品属性 [波长范围] 0.15 - 12µm [功率范围] 100nW – 100mW