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MODEL SSP-4 SOLID-STATE INFRARED PHOTOMETER TECHNICAL MANUAL FOR THEORY OF OPERATION AND OPERATING PROCEDURES OPTEC,

6 Of course, the gain stability of this circuit is highly dependent on the resistance stability of the feedback resistor. Fluctuations of its val

7 linear, resulting in laboratory measured correlation coefficient using a least squares regression of r = 0.99995. There is an offset adjustment

8 SECTION 3.0 OPERATING PROCEDURE 3.1 CHECK-OUT LIST Remove the filter slider and clean filters, if necessary, with a cotton swab dipped in alc

9 Light energy from any observatory red light will be a serious source of error for this photometer. Tungsten lamps are a rich source of IR in the s

10 Figure 3-2. 2-Button Control Menu Flow Chart 3.4 CALIBRATION AND ADJUSTMENTS For precise determination of stellar magnitude, the filters us

11 difference. This method is used by many members of the IAPPP and is recommended for novice users. The reticule and detector are critically

12 SECTION 4.0 PC SERIAL INTERFACE AND COMMANDS 4.1 PC (RS-232) SERIAL COMMUNICATIONS The SSP-4 provides a serial communications feature as sta

13 Command Return SSTART ! CR LF Function: This command initializes the serial connection between the PC and the SSP-4. SSTART causes the SSP-4

14 Command Return SIwxyz none Function: This command sets the integration time for acquiring a count from the voltage-to-frequency converter.

15 Command Return STEMxy none Function: This command sets the detector operating temperature in degrees celsius below 0. Thus, a xy value of 05

Figure 1-1. SSP-4 Solid-State Infrared Photometer shown with TCF-S Focuser.

16 SECTION 5.0 TROUBLE-SHOOTING GUIDE The following common problems and solutions have been collected over the years from our customers a

17 SECTION 6.0 SPECIFICATIONS DETECTOR (G5851-203) Type InGaAs PIN-photodiode NEP 2x10-14 W/Hz (typical) at –35 C Detector Size 0.3mm diamete

18 SECTION 7.0 J & H FILTERS

19 Figure 7-1. J & H Filter Specifications.

A-1 Appendix A InGaAs PHOTODIODE

A-2

A-3

A-4

A-5

B-1 Appendix B WIRING DIAGRAM

i TABLE OF CONTENTS Revision 1 – June 2010 Section Page 1.0 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

B-2

C-1 Appendix C COMPONENT LAYOUT & CIRCUIT DIAGRAMS Figure C-1. SSP-4 Circuit Board Component Layout.

C-2

C-3

D-1 Appendix D SAMPLE DATA ENTRY FORM The sample report form printed on the next page is useful for recording data when using the differential

D-2 VAR __________________________________ VAR. ______________________________ DOUBLE DATE _______________________ COMP.__________________________

ii LIST OF FIGURES Figure Page 1-1 SSP-4 Solid-State Infrared Photometer with TCF-S focuser . . . . . . . . . . . . . . . . . . . . . . cover 1-2

1 SECTION 1.0 INTRODUCTION – a personal history by Gerald Persha The SSP-4 IR photometer has a long history at Optec. In 1984 a prototype unit wa

2 Fig. 1-2. SSP-4 System Components

3 Fig. 2-1. Cross-sectional view of the SSP-4

4 SECTION 2.0 THEORY OF OPERATION 2.1 BASIC PHYSICAL CHARACTERISTICS Figure 2-1 shows a cross-sectional view of the SSP-4 photometer. Ligh

5 2.2 THE DETECTOR The detector used in the SSP-4 is a model G5851 manufactured by Hamamatsu Corporation. This unit can be classified as an In