The means by which a detector signal is acquired, amplified and
processed is designated as the "Signal Detection System". The OL Series 750 can
be obtained with one or more of the following signal detection systems:
- DC Amplification
- AC Lock-In Amplification
- Pulse Integration
- Photon Counting
Although many measurement applications require only one type
of signal detection system, there are situations where the user may require two or more
signal detection systems. This unique feature enables the user to maximize the overall
system sensitivity by coupling a signal detection system with the most appropriate
high-sensitivity detector. The optional Signal Detection Systems are pre-installed at the
factory in the OL 750-C and are set up through the optOLab General Operating System
software. The switching of signal detection systems and detectors is also performed under
computer control.
- OL 750-SDS-210 DC Amplification
- OL 750-SDS-230 Pulse Integration
- OL 750-SDS-220 AC Lock-In Amplification
- OL 750-SDS-240 Photon Counting
OL 750-SDS-210 DC Amplification Detection System
The DC Signal Detection System can be used with the following types of detectors:
- Silicon
- Germanium
- Photomultipliers
- InGaAs
Extremely high sensitivities are obtainable with the DC
amplification system. It is also possible to use the OL 750 with the DC amplification
detection system independent of the monochromator. Additional detector calibrations and
optical filters allow the OL 750 to operate as a radiometer or photometer.
| Ampere Range |
10-4 to 10-12 Amperes (FS) |
| Resolution |
10-15 Amperes |
| Accuracy10-4 to 10-8 Amperes (FS) |
± 0.5 |
| 10-9, 10-10 Amperes (FS) |
± 1% |
| 10-11, 10-12 Amperes (FS) |
± 1.5% |
|
OL 750-SDS-220 AC Lock-In Amplification Detection System
The AC Lock-In Amplification Detection System can be used with the following types of detectors:
- Silicon
- InSb
- InGaAs
- Germanium
- Pyroelectric
- PbSe
- PbS
- Photomultipliers
- HgCdTe
| AC Current Mode Operation |
| Ampere Range |
10-3 to 10-11 Amps (FS) 1/ |
| Resolution |
10-14 Amps |
| Accuracy |
± 1% |
| Bandwidth |
10 Hz to 250 Hz |
|
| AC :Volt Mode Operation |
| Voltage Range |
101 to 10-4 Volts (FS) 1/ |
| Resolution |
100 nV |
| Accuracy |
± 1% |
| Bandwidth |
10 Hz to 500 Hz |
|
| AC nVolt Mode Operation |
| Voltage Range |
10-1 to 10-6 Volts (FS) 1/
|
| Resolution |
1 nV |
| Accuracy |
± 1% |
| Bandwidth |
10 Hz to 500 Hz |
|
1/ Calibrated relative to peak-peak square wave (2.2283 * RMS).
OL 750-SDS-230 Pulse Integration Detection System
The Pulse Integration Detection System is used when measuring the energy of a pulsed light source. It can be used with the following types of detectors:
- Silicon
- Germanium
- Photomultipliers
- InGaAs
As with the DC Signal Detection System, measurements can be made independently of the monochromator.
| Coulomb Range |
10-4 to 10-10 Coulombs |
| Resolution |
10-13 Coulombs |
| Accuracy |
± 2% |
| Sync Output |
TTL Level |
| Input Signal Connector |
BNC |
| Zero Compensation |
Computer-Controlled |
|
OL 750-SDS-240 Photon Counting Detection System
The Photon Counting Signal Detection System is used for extremely high sensitivity
spectroradiometric measurements. It is used with photon counting photomultipliers, OL
750-HSD-315 or OL 750-HSD-316.
| Counter 1 Input |
20 MHz, 32 Bit ECL Logic |
| Counter 1 Maximum Count |
4 x 109 Photons |
| Counter 2 Input |
20 MHz, 24 Bit TTL Input |
| Counter 2 Maximum Count |
1.6 X 107 Photons |
| Counting Period Accuracy |
± 100 ppm; ± 1 ms |
| Dead Time |
100 ns |
| Software Dead Time |
3 m s |
| Count Overload |
100,000 cps |
| Photon Counting Voltage |
-800 Volts (Approximately) |
|
Operation of the OL 750-SDS-240 Photon Counting Detection System requires that the Photon Counter PCB be installed in the OL 750-C
Controller. The OL 750-SDS-240 also requires a photon counting detector module, such as the OL 750-HSD-315 or OL 750-HSD-316. The
OL 750-HSD-315 consists of the DH-315 (S-20) Photon Counting Photomultiplier Detector Head and the DSM-6 Amplifier-Discriminator
Detector Support Module. The OL 750-HSD-316 consists of the DH-316 (Solar Blind) Photon Counting Photomultiplier Detector Head and
the DSM-6 Amplifier-Discriminator Detector Support Module.
Software operation is consistent with that of other photoemissive detector heads. The unit
of measure is counts per second "cps". The settling time and integration time
variables may be optimized for the best signal to noise or increased scan speed to suit
the application.
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