Spectrometer reading correction reminding device

Abstract

The invention relates to a spectrometer experiment instrument for college physics experiment, and specifically relates to a spectrometer reading correction reminding device. The spectrometer reading correction reminding device comprises annular grooves arranged in the outer ring of a spectrometer vernier dial. The annular grooves are internally provided with photoelectric doors at the places corresponding to zero graduation positions of two vernier scales of the vernier dial respectively; a spectrometer calibrated dial is provided with light barrier sheets, arranged in the annular grooves, at the places corresponding to the zero graduation positions respectively; the vernier dial is provided with a buzzer and a light-emitting diode at the place corresponding to each photoelectric door; and each photoelectric door is electrically connected with a spectrometer power supply, and the corresponding buzzer and the light-emitting diode to form an alarm system. The reminding device can automatically judge whether the zero graduation of the calibrated dial and the zero graduations of the vernier scales meet, and judges whether reading correction is needed and reminds that the readings of which side of vernier scale and calibrated dial need to be corrected, thereby solving the problem of incorrect judgment of zero-crossing problem of the calibrated dial for each student, helping the students to carry out reading correction, reducing operation difficulty of each student and improving data record accuracy.

Description

technical field [0001] The invention relates to a spectrometer experimental instrument used in university physics experiments, in particular to a spectrometer reading correction reminding device. Background technique [0002] A spectrometer is an instrument for accurately measuring the deflection angle of light. Many basic physical quantities in optics, such as wavelength and refractive index, can be directly or indirectly expressed as the deflection angle of light. Therefore, the wavelength and refractive index can be measured by using a spectrometer. Accurately measure the included angle between optical planes. At present, most domestic colleges and universities use traditional spectrometer experimental instruments. The reading device is a traditional mechanical dial. When the traditional spectrometer leaves the factory, the plane of the dial has been adjusted to match the The rotation axis of the instrument is vertical and fixed. The scale disc is divided into degrees. Th...

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Problems solved by technology

[0002] A spectrometer is an instrument for accurately measuring the deflection angle of light. Many basic physical quantities in optics, such as wavelength and refractive index, can be directly or indirectly expressed as the deflection angle of light. Therefore, the wavelength and refractive index can be measured by using a spectrometer. Accurately measure the included angle between optical planes. At present, most domestic colleges and universities use traditional spectrometer experimental instruments. The reading device is a traditional mechanical dial. When the traditional spectrometer leaves the factory, the plane of the dial has been adjusted to match the The rotation axis of the instrument is vertical and fixed. The scale disc is divided into degrees. The minimum division value is half a degree. Values ​​smaller than half a degree can be read on the vernier. The two verniers are in the radial direction of the edge of the black inner disc. The vernier disc is generally fixedly connected with the stage and can rotate around the axis of the instrument. There are screws to stop the vernier disc. The reading method of the scale disc is similar to that of the vernier caliper. In order to eliminate the eccentricity difference between the scale disc and the central axis of the spectrometer , a vernier is installed at both ends of the same diameter of the dial. When measuring, both verniers should read, and then calculate the difference between the two readings of each vernier, and then take the average value. This average value can be used as a However, many years of teaching practice have found that the troublesome problem in the process of reading for students is: using a spectrometer, since the dial is a disc, it will return to zero every time it passes 360° , if the zero scale of the dial and the zero scale of the vernier meet during the rotation, that is, there is a problem of "zero crossing" of the dial, the reading of the dial on the side where the vernier meets must be corrected, and 360° should be added to or subtracted from the corresponding reading. ° and then calculate the deflection angle, otherwise the result will be wrong. For example, the vertex angle of the prism should be 60°. If it is not corrected, it may be calculated as 240°. If it does not meet, it does not need to be corrected. The existing scheme It is to carefully explain the cause of this problem and the reading correction method to the students. However, it is difficult for the students to judge whether it needs to be corrected and which side of the vernier dial to correct the reading. This often leads to data recording errors. Some people use digital devices to completely replace the original machinery. Although the disk is convenient, it will cause new problems, such as the introduction of new errors in signal conversion, the introduction of new eccentricity, and the loss of the original precision of the mechanical disk. At the same time, too intelligent will also weaken the students' hands-on ability. , is not conducive to the cultivation of innovation ability

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