This is a collection of Polytec board photos from items I own. Here is picture collection #2 of boards from the Internet.
OFV-3000 Vibrometer Controller
VM301-2500B Input Board
Avantek GPD-464, Avantek GPD-201, LF355, MCL RPD-1, MCL PLP-100, EL2030, MCL PLP-10.7, MCL SRA-1, EL2020, MCL PLP-50, SP92701, MC1658
The SP92701 feeds pins 7 & 8 on the RPD-1. The input to the SP92701 is from MC1658 pin 4.
VM301-2400C Output Board
VM301-6000E PLL Velocity Board (w/ Fringe Counter Outputs) (OVD-01)
The Polytec OVD-01 is a velocity output module which plugs into the OFV-3001 modular controller. It consists of one printed circuit board. The OVD-01 uses a special PLL decoding scheme which converts the Doppler signal from the optical sensor into a calibrated velocity output. The OVD-01 is characterized by it's very high linearity (0.5%) and low noise level. The maximum operating frequency is 50 kHz. There are 5 different velocity ranges to choose from: 10 mm/s, 50 mm/s, 250 mm/s, 1.25 m/s and 10 m/s full scale peak.
The OVD-01 is a velocity decoder for applications in the acoustic frequency range up to approximately 20 kHz. In this range, it has excellent linearity and accuracy characteristics. With five measurement ranges from 1 mm/s/V to 1,000 mm/s/V it covers the full dynamic range of the vibrometer with high resolution. The upper four measurement ranges can be used up to frequencies of 50 kHz and higher while retaining their good characteristics, however amplitude accuracy and linearity decrease with higher frequencies. The measurement ranges 125 mm/s/V and 1,000 mm/s/V can be used from the frequency 0 Hz (full DC capabilit).
11C44, Micro Networks MD3810 (volt-to-freq), MC4044, EL2020, LT1016, LF355, REF08 (-10V ref)
VM301-2300B Local Oscillator Board (30-60 MHz)
11C90, MC12040, LF355, Avantek GPD-464
VM301-2200A Master Oscillator Board (80 MHz to Bragg Cell)
FOX F1100H 80 MHz clock oscillator, Avantek GPD-130, 74LS196
VM301-2600A Velocity Decoder Replacement Board (Phase Multiplier Replacement Board)
OFV-3000 Backplane
Rear-View: J1 is on the left. Front-View: J1 is on the right.
- J1: VM301-2400B Input Board
- J2: VM301-2600A Velocity Decoder Replacement Board (Pass-Through)
- J3: Empty
- J4: VM301-2400C Output Board
- J5: Empty
- J6: VM301-6000E PLL Velocity Board (w/ Fringe Counter Output) (OVD-01)
- J7: Empty
- J8: Empty
- J9: VM301-2300B Local Oscillator Board (30-60 MHz)
- J10: VM301-2200A Master Oscillator Board (80 MHz to Bragg Cell)
Configuration: Velocity Decoder 5 HL Ranges Displacement Decoder 0 Ranges Remote Focus Control Installed IEEE Bus Interface Installed |
I don't think this particular OFV-3000 was setup to measure displacement, but I don't know...
OFV-2810 Dual HF Vibrometer
Dual-output vibrometer with a fixed (?) velocity resolution of 125 mm/s/V.
VM270-6200A HF Demodulator (Input)
Frequency discriminator (frequency-to-voltage) via a coaxial delay line and 90° phase shift into the MCL RPD-1.
Both channels, "Channel A" and "Channel B" use the same hardware.
CLC520, EL2030, MCL PSCQ-2-50, MCL RPD-1
OFV-2810 Inverter Board
VM270-2400A Output Board (Unpopulated, Connection for LCD Panel)
VM270-2200A Master Oscillator (80 MHz to Bragg Cell)
80 MHz clock oscillator through a LC low-pass filter and output to Bragg cell.
VM280-1400C Front-Panel
Harris HD3-6402B-9 UART, Maxim ICM7211 LCD driver, MAX232, LM3914, M2716 EPROMS.
DFE-650 DSP Front End
VM265-2265A Master Oscillator (80 MHz to Bragg Cell)
80 MHz clock oscillator, MC10H104 2-input NAND gate, MC10H016 4-bit binary counter, MCL PLP-50, MCL PLP-90
DFE-0650-QD11A Quadrature Demodulator
I believe this takes the 39.831 MHz LO, splits it to 0° and 90° for LOs to the AD831. Signal to AD831 RF input and IF out through 10.7 LPF and AD811 buffers. The IF output (40.000 MHz - 39.831 MHz = 168 kHz) is sent to rear-panel mounted fringe counter output.
AD831, AD811, Motorola HEL16 (?), MCL PSCQ-2-70, MCL PLP-50, MCL PLP-70, MCL PLP-10.7, MCL T2-1T
VD660-2265A Master Oscillator (39.831 MHz to Quadrature Demodulator Board?)
VD Input Board (Inside the Shielded Box)
U3 is some type of resonator/filter/delay line: "S+M X.6960M KB/E2"
AD606, AD811, Motorola HEL16 (?), OPA2107, OPA646, MCL PLP-50 (50 MHz LPF), MCL T8-1T (Transformer), A03 (MCL MAR-3)
DFE-650 Backplane
Rear-View: J1 is on the left. Front-View: J1 is on the right.
- J1: DFE-0650-INP1A Input Board (Takes up two slots, technically.)
- J2: VD660-2265A Master Oscillator (39.831 MHz)
- J3: DFE-0650-QD11A Quadrature Demodulator
- J4: VM265-2265A Master Oscillator (80 MHz)
DBM-17W2S Pin-Out "Green Panel" Pin Description 1 Brown 1 Ground 2 Red 7 +5 VDC 3 Pink 2 +16 VDC 4 Yellow 1 Ground 5 Green 3 -15 VDC 6 Blue 2 +16 VDC 7 Violet 8 Ground 8 Grey 8 Ground 9 White 2 +16 VDC 10 Black 3 -15 VDC 11 Brown w/ Green 6 12 Red w/ Blue 5 Signal Level 13 Yellow w/ Brown 4 -5.2 VDC 14 No Connection 15 White w/ Yellow 8 Ground A1 Coaxial: Signal Input or 80 MHz Bragg Out A2 Coaxial: Signal Input or 80 MHz Bragg Out |
LSV-065 Linear Surface Velocimeter
Dual-beam velocimeter, one beam is unmodulated, the other beam is modulated and deflected by the 40 MHz AOM. Receive is via the center-mounted avalanche PIN photodiode.
Red laser diode (670 nm) on a Peltier cooler.
L2724 for Peltier control. Adjust pots for TEMPERATUR (P1), LASERPOWER (P3), LASERCURRENT (P2), and FREQUENCY (P4). The main control board has AD654, AD820A, AD822A, REF02, C393C, ICM555, ILD206 optocoupler.
Main board: BRAGGCELL (CON5, +15V Out), APD (CON6, +15V Out), TEMPSENSOR (CON8, In from Bragg cell temp sensor), HV-MODUL (CON7, +15V Out), LED (CON4), LASER (CON3, 3 wires), PELTIER (CON2, 6 wires, red & black go to Peltier, the others are thermistors)
The 8-pin IC on the HV board might be a AD780 used for the voltage set, but it's hard to read.
40 MHz Bragg cell has an internal clock source and a 10 MHz reference output which is divided down from the 40 MHz crystal.
Avalanche PIN photodiode (A1631, unknown manufacture) with a +230 VDC (iseg MHp-2.5-105-TC-v3) reverse bias, CXA1685, 78L05, MCL MAR-8 MMIC
Coax outputs for 10 MHz Reference and Signal.
DBM-17W2S Pin-Out Guesses: 1: Ground 2: No Connection 3: +15 VDC 4: Ground 5: Ground 6: +15 VDC 7: Goes to ILD206 pin 8 (collector output, which is an isocoupled output from the AD654, which has it Vctrl input from the Bragg cell temp sensor) 8: To CON2 on Laser Diode Block (Thermistor?) 9: To CON2 on Laser Diode Block (Thermistor?) 10: -15 VDC 11: Goes to IDT206 pin 8 (collector output) 12: +5 VDC Laser On (There is a delay for the Peltier to come to temperature.) 13: -5 VDC (There is a high peak current for Peltier, then settles down to 200 mA or so.) 14: No Connection 15: Ground |
OFV-400 Sensor Head
Dual BPW97 PIN photodiodes (VM400-1700A) in a differential config and slightly tilted (?), NE5212A, MCL MAR-3 MMIC?
This was a "parts" unit and is missing some of the optics (not sure which ones!).
The Bragg AOM (VM400) has an internal 40 MHz source and is powered by +15 VDC.
OFV-302 Sensor Head
The Bragg AOM (VM302-2000A) requires an external 80 MHz source (+7 dBm or so). It has an internal divide-by-2 circuit (SP9131) and is powered by +15 VDC. The AOM itself is an IntraAction AEM-402B. The RF power amplifier section is based around an Avantek GPD and BLY91A transistor for about 2 watts output.
The laser source is Uniphase 1103P-2026 (2 mW, 633 nm).