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S7105-05 Datasheet(PDF) 11 Page - List of Unclassifed Manufacturers |
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S7105-05 Datasheet(HTML) 11 Page - List of Unclassifed Manufacturers |
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11 / 16 page  8 The position detection error is usually measured with a light beam of φ200 µm, so the specified areas shown in Figures 4-4 to 4-6 are used for position detection error. Position detection error for two-dimensional PSDs is sep- arately measured in two areas: Zone A and Zone B. Two zones are used because position detection error in the circumference is larger than that in the center of the ac- tive area, · Zone A: Within a circle with a diameter equal to 40 % of one side length of the active area. · Zone B: Within a circle with a diameter equal to 80 % of one side length of the active area. Figure 4-4 Specific area for one-dimensional PSD position detection error (resistance length ≤ 12 mm) Figure 4-5 Specific area for one-dimensional PSD position detection error (resistance length > 12 mm) Figure 4-6 Specific area for two-dimensional PSD position detection error KPSDC0063EA KPSDC0074EA KPSDC0075EA Figure 5-1 Basic connection example of one-dimensional PSD and current-to-voltage conversion type operational amplifier KPSDC0076EA Position resolution is the minimum detectable displace- ment of a spot light incident on PSD, expressed as a dis- tance on the PSD surface. Resolution is determined by the PSD resistance length and the S/N. Using formula (1-6) as an example, the following equation can be established. In cases where the positional displacement is infinitely small, the noise component contained in the output current IX2 clearly determines the position resolution. Generally, if the PSD noise current is In, then the position resolution ∆R is given as follows: Figure 5-1 shows the basic connection example when us- ing a PSD in conjunction with current-to-voltage amplifiers. The noise model for this circuit is shown in Figure 5-2. ∆x: Small displacement ∆I: Change in output current Then, ∆x can be expressed by the following equation. IX2 + ∆I = . Io ......... (5-1) XB + ∆x LX ∆x = LX . ........................... (5-2) ∆I Io ∆R = LX . .......................... (5-3) In Io Characteristic and use 5. Position resolution Io : Photocurrent ID : Dark current Rie: Interelectrode resistance Cj : Junction capacitance Rf : Feedback resistance Cf : Feedback capacitance en : Equivalent noise input voltage of operational amplifier in : Equivalent noise input current of operational amplifier Vo : Output voltage KPSDC0077EA Figure 5-2 Noise model SPECIFIED RANGE LX × 0.75 RESISTANCE LENGTH LX OUTPUT ELECTRODE X1 OUTPUT ELECTRODE X2 ACTIVE AREA SPECIFIED RANGE LX × 0.90 RESISTANCE LENGTH LX OUTPUT ELECTRODE X1 OUTPUT ELECTRODE X2 ACTIVE AREA ACTIVE AREA ZONE B ZONE A Rf Cf PSD - + - + Rf Cf A A VR ~ - + Rf Cf in en A Vo PSD IO ID Rie Cj |
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