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Summary of Contents for Newport 290 Series
- Page 1 U S E R ’ S G U I D E Quadcell Photoreceivers Model 290X phone: (877) 835-9620 e-mail: tech@newport.com www.newport.com...
- Page 2 Warranty Newport Corporation guarantees its products to be free of defects for one year from the date of shipment. This warranty is in lieu of all other guarantees, expressed or implied, and does not cover incidental or consequential loss. Information in this document is subject to change without notice.
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Page 3: Table Of Contents
Contents Introduction Overview ........5 Tips for Best Operation ..... 5 Operation Setting up the Receiver . - Page 4 4 • Contents...
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Page 5: Introduction
± photoreceiver can be operated from battery or a 15 V DC power supply (we recommend the low-noise Newport Model 0901 power supply for best performance). Each model has a photodiode with a 3-mm diameter active region. Tips for Best Operation... - Page 6 Using Optical Filters Narrow-band optical filters, which transmit your laser’s wavelength while blocking other light sources, can be installed in a Newport Model 1280 1" filter holder. Many filters are commercially available. When using optical filters during position measurement, please consider the effects of multiple surface reflections.
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Page 7: Operation
Operation Setting up the Receiver 1. Supply power. The Model 290X is powered either by a single 9-V alkaline battery, or by a +/- 15 V DC power supply. If both battery and exter- nal power are present, an internal relay connects the external power to the amplifier circuitry. -
Page 8: Checking And Replacing The Battery
Electrical ground is only introduced to the housing through the BNC outer shells, and the power-supply ground pin. If you use a floating measurement instrument or a floating power supply, the photoreceiver may not be electrically grounded. 4. Align an optical beam onto the detector. Be careful to keep the optical power below the stated limits to avoid damage to the photore- ceiver and amplifier circuitry. -
Page 9: Using An External Power Supply
The Model 290X can be operated from any power ± supply which can supply 50 mA of 15V DC power. Newport recommends use of the Model 0901 Power Supply, which features three pairs of low-noise linear ± 15 V DC outputs. - Page 10 10 • Operation...
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Page 11: General Features And Principles
General Features and Principles Amplifier Circuitry The circuitry inside of the Model 290X consists of a two-stage amplifier, with parallel gain paths for X, Y, and SUM outputs. Each stage has an adjustable gain and bandwidth. Figures 1 through 3 illustrate the basic circuit design, and t he table on page 13 shows the gain and bandwidth of each amplifier stage for each possible setting of the rotary switch. - Page 12 depends on the setting of the gain switch, and can vary from 1 to 10. The bandwidth of this gain stage also varies, as indicated in the table on page 13. Figure 2: Signals from 1000 ) “DELTA Y” each quadrant are differenced and amplified at a second stage...
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Page 13: Gain And Bandwidth
Gain and Bandwidth The following table shows the gain and bandwidth of each amplifier stage as a function of switch setting. ∆-Stage BW Gain Gain Gain Switch 1st-Stage Sum-Stage (kHz) Position BW (kHz) BW (kHz) (V/A) (V/V) (V/V) approx. 30 mW (1) 0.03 30 mW (3) 0.03... -
Page 14: Normalization Of Outputs
Normalization of Outputs The signals X and Y vary in response to changes of the light position relative to the center of the quadrant photodiode. Because X and Y also vary in response to changes of the total light power, the SUM signal is provided as a means of normalization. - Page 15 If the optical beam under measurement is not Gaussian, the above relationship will not hold. For example, if the beam is elliptical, the transfer function will be different along the major and minor axes. You can calibrate the position transfer function effectively by placing the photoreceiver on a two-axis translation stage and measuring output as a function of position.
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Page 16: Selecting The Optimal Gain Setting
20*log[V (f )/V (DC)] where V (f ) is the output from the X, Y, or SUM output of the receiver. Newport uses the -3 dB electrical definition for bandwidth. 16 • General Features and Principles... - Page 17 Figure 6: 2901 Frequency Response (30 µW Settings) Frequency response for X, Y and SUM outputs with 30-µW saturation setting = 200 ohm) XY10 XY10 1.E+00 1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 Frequency (Hz) Figure 7: 2901 Noise (30 µW Settings) Output voltage 1.E-05 noise spectral...
- Page 18 Figure 9: 2901 Noise (3 mW Settings) Output voltage 1.E-05 noise spectral density for X, Y outputs with 1.E-06 3-mW saturation setting 1.E-07 = 2 kΩ) 1.E-08 Frequency (kHz) Figure 10: 2901 Noise (30 mW Settings) Output voltage 1.E-05 noise spectral density for X, Y outputs with 1.E-06...
- Page 19 spectral density over the frequency range (f to f observed by your measurement system: ∫ For a flat noise spectrum in a DC-coupled measurement system with a 3-dB bandwidth of f the measured rms noise will be . 2π ⋅ ⋅...
- Page 20 actual ∆ SIGNAL SIGNAL ----------------------------------------------------- actual actual n SUM actual ≈ ---------------------------- ---------------------------- actual actual The bandwidth of the SUM output is intentionally limited to 30 Hz, which reduces the contribution of to negligible in most cases. Therefore, the n_SUM position uncertainty is simply equal to the output voltage noise divided by the normalized SUM output, multiplied by the position transfer function.
- Page 21 will be 1 mW * 0.5 A/W (responsivity at 633 nm) * 2 kΩ = 1 V. The integrated voltage noise in 100 kHz bandwidth on this setting (Figure 9) is 0.1 mV rms. Putting it all together, the observed position noise due to electronics will be 0.00065*radius (rms).
- Page 22 22 • General Features and Principles...
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Page 23: Characteristics
Characteristics Physical Specifications output BNC (X) output BNC (Y) output BNC (SUM) power switch battery check LED gain setting switch quad cell 3mm × 3mm 4.17" active area (105.9) 2x 1.040-32 THD for mounting 1.00" (25.4) Model 1280 Filter Holders (not included) 1.25"... -
Page 24: Operating Specifications
Operating Specifications Model 2901 Model 2903 3-dB Bandwidth (typical) 100 kHz 100 kHz Conversion Gain to 10 2x10 to 2x10 Maximum Responsivity 0.5 A/W 1 A/W Transimpedance Gain 2x10 to 2x10 2x10 to 2x10 Outputs X, Y, SUM X, Y, SUM Ω... -
Page 25: Customer Service
Customer Service Technical Support Information and advice about the operation of any Newport product is available from our technical support engineers. For quickest response, ask for “Technical Support” and know the model number and serial number for your product. Hours: 8:00-5:00 PST, Monday through Friday... - Page 26 26 • Customer Service...
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