Bomem-GRAMS User's Guide

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Section 1.1 Check the signal Figure 1-2. Parameter Setup dialog box 4. Set the spectrometer resolution to 4 cm -1 . If the spectrometer has a manual resolution switch, turn the knob to 4. If the spectrometer resolution is computer controlled, select Instrument Status and Control and set the Resolution to 4 (see Figure 1-3 below). Figure 1-3. Instrument Status and Control dialog box 5. Select Align to display the Align dialog box (see Figure 1-4 on page 3). 2 Bomem-GRAMS User's Guide
Chapter 1 Quick Start Figure 1-4. Align dialog box Set the parameters as follows: Spectral Range Start and End: • for MIR: 4000 to 400 cm -1 • for NIR: 14 000 to 4000 cm -1 Show Scan direction: Both directions Data type: Single-Beam 6. Click OK Align to begin data acquisition in the align mode. This will allow you to make sure the spectra will be properly acquired without detector saturation. In the align mode, the display is continuously updated until the Halt Collect command is selected. No data is saved in this mode. 7. Observe the displayed spectrum. The word Align near the upper right corner of the display indicates the interferogram amplitude as a percentage of the maximum allowed (refer to Maximum interferogram amplitude allowed on page 21). This percentage should be between 40% and 90%. 8. Check for any unusual spectral features such as a strong signal below the detector cut-off frequency (usually caused by detector saturation). Note: Bomem-GRAMS can automatically detect this condition. Refer to Optical Cut-Off Detection on page 21. Figure 1-5 on page 4 shows typical open-beam spectra for MIR (mid infrared) and NIR (near infrared). Bomem-GRAMS User's Guide 3
Page 1: Bomem-GRAMS User's Guide This manua
Page 4 and 5: No right to print, copy, in whole o
Page 7 and 8: T ABLE OF CONTENTS About this Manua
Page 9: ABOUT THIS M ANUAL Audience a This
Page 14 and 15: Section 1.1 Check the signal Figure
Page 16 and 17: Section 1.3 Acquire a sample spectr
Page 19: CHAPTER 2 BOMEM-GRAMS 2.1 Descripti
Page 22 and 23: Section 3.2 Computer requirements 3
Page 24 and 25: Section 3.3 Software installation F
Page 26 and 27: Section 4.1 Description Parameter S
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Page 30 and 31: Section 4.1 Description • Buffer
Page 32 and 33: Section 4.1 Description Threshold d
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Page 36 and 37: Section 4.1 Description j For trans
Page 38 and 39: Section 4.1 Description • Instrum
Page 40 and 41: Section 4.1 Description • Halt cu
Page 42 and 43: Appendix A Apodization Functions Na
Page 44 and 45: Appendix B Array Basic Interface Ar
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Page 57 and 58: APPENDIX D GLOSSARY Note: The follo
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Appendix D Glossary nonlinearity A
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Appendix D Glossary Lowering the re
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Appendix D Glossary The transmittan
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A Align............................
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general parameters initial delay...
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Analytical and Advanced Solutions 5
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Bomem-GRAMS User's Guide

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