CN200976003Y - Rotary sample rack - Google Patents

Abstract

The utility model discloses a rotating sample holder, which comprises: a three-dimensional translation platform, a stepping motor connected with the three-dimensional translation platform through a connecting plate, a disc sample whose circle center is connected with the central axis of the stepping motor Rack, more than one sample round hole arranged on the disc sample rack, wherein the centers of every two adjacent sample round holes are respectively connected to the center of the disc sample rack, and every two adjacent connected The angles between the lines are the same in degrees. The rotating sample holder can reduce errors caused by noise during terahertz time-domain spectrum measurement and improve measurement accuracy.

Description

Rotate the sample holder

technical field

The invention relates to the field of spectrum measurement, in particular to a rotating sample holder for terahertz time-domain spectrum measurement.

Background technique

In terahertz time-domain spectroscopy measurement, the delay device changes the optical path difference between the probe light and the pump light, so that the probe light samples and measures the electric field intensity of the terahertz pulse at different times, and finally obtains the electric field intensity of the terahertz pulse time waveform. For a typical terahertz time-domain spectroscopy system, the main source of noise is the pump laser. Because it is very sensitive to small fluctuations in temperature and humidity, the amplitude and position of the terahertz pulse signal will vary with the measurement time. Fluctuation, the data measured at different times cannot be completely repeated, resulting in measurement errors.

In the existing measurement method, the signal of the reference sample is measured first, and then the position of the sample holder is moved by moving the motor; or the sample holder is moved to the position of the sample by manual push and pull, and then the signal of the sample is measured. In the experiment, the time interval between the spectral measurement of the reference sample and the sample is about 5 minutes. During this period, some unstable factors will bring errors to the measurement results, and it is difficult to realize the quantitative analysis of the measured samples. Especially when comparing several samples of the same system, if the difference in signal between samples is small, this difference can easily be masked by such small fluctuations.

Contents of the invention

The purpose of the utility model is to provide a rotating sample rack which reduces the error caused by the noise in the terahertz time-domain spectrum measurement and improves the measurement accuracy.

The purpose of this utility model is achieved by the following technical solutions:

A rotating sample holder, which includes: a three-dimensional translation platform, a stepping motor connected to the three-dimensional translation platform through a connecting plate, a disc sample holder whose circle center is connected with the central axis of the stepping motor, and a More than one sample hole on the disk sample holder.

Wherein, the centers where the two adjacent sample circular holes are located are respectively connected to the center of the disc sample holder, and the included angles between the two adjacent connecting lines are the same.

Wherein, the stepper motor is connected with a pair of controllers for controlling its rotational speed.

Wherein, the three-dimensional translation stage is provided with a knob for adjusting the initial position of the circular hole of the sample.

The positive progressive effect of the present utility model is:

When using a rotating sample holder for terahertz time-domain spectroscopy measurement, multiple samples can be detected sequentially at each time-domain point, eliminating the difference in the detection time of each sample, and the signal transmitted through the sample and the signal transmitted through the reference sample are almost simultaneously performed Compared, the measurement accuracy is greatly improved, and the error caused by noise is reduced. Especially when comparing several samples of the same system, it can more truly reflect the difference between the sample signals.

Description of drawings

Fig. 1 is a schematic structural view of a preferred embodiment of the present invention.

Fig. 2 is the internal optical path diagram of the measuring instrument used in the preferred embodiment of the utility model.

Detailed ways

The preferred embodiments of the utility model are given below in conjunction with the accompanying drawings to describe the technical solution of the utility model in detail.

A rotating sample holder is used for terahertz time-domain spectroscopy measurement. It includes: a three-dimensional translation stage 1, a stepping motor 2 and a disk sample holder 3. Wherein, the stepping motor 2 is fixed on the three-dimensional translation platform 1 through a connecting plate 6 . Six sample circular holes 4 are evenly distributed on the disk sample holder 3 , that is, the centers of every two adjacent sample circular holes 4 are respectively connected to the center of the disk sample holder, and each included angle is 60 degrees. The circle center of the disk sample holder 3 is connected and fixed with the central shaft 5 of the stepping motor so that there is no relative displacement during the rotation. The three-dimensional translation stage 1 is provided with an adjustment knob 7, which can set the initial position of the sample circular hole 4.

When in use, the samples are placed in the sample circular holes 4 on the disk sample holder 3, one of which is a reference sample, and the rest are samples to be tested. Use the adjustment knob 7 of the three-dimensional translation stage 1 to set the initial position of the sample hole 4, so that the terahertz incident spot 10 (the position of the spot 10 is fixed) on the measuring instrument passes through the center of the sample hole 4 . The delay device of the measuring instrument stays at each time domain point for a certain time, that is, keeps the optical path difference between the probe light 9 and the pump light 8 unchanged. At the same time, the stepping motor 2 drives the disk sample holder 3 to rotate. During this process, whenever the sample hole 4 rotates until its center coincides with the position of the terahertz incident spot 10, the stepping motor 2 drives the disk sample holder 3 The rotation stays for a certain period of time, waiting for the data of the sample to be collected. The stepper motor 2 is connected with a pair of controllers that control its rotational speed, and the stepper motor 2 is controlled by command setting through Labview software, so that the time required for each two adjacent sample circular holes 4 to rotate through It is the same, and the time that the terahertz incident light spot 10 stays at each sample circular hole 4 is also the same, so that the signals can be collected at equal intervals. Since the measuring instrument and controller are prior art, we will not Let's introduce it in detail. After the disk sample holder 3 rotates one circle, the delay device enters the next time-domain measurement point, and repeats the above operations, so that the signal transmitted through the sample and the signal transmitted through the reference sample are compared almost simultaneously, eliminating the problem caused by the difference in detection time. The difference is to improve the measurement accuracy and reduce the error.

Claims (4)

1, a kind of rotation specimen holder, it is characterized by, it comprises: the stepper motor that a D translation platform, is connected with this D translation platform by a plate, and the disk sample frame that a center of circle links to each other with this stepper motor central shaft, one is arranged at the more than one sample circular hole on this disk sample frame.

2, rotation specimen holder according to claim 1 is characterized by, and every adjacent two these centers, sample circular hole place link to each other with the center of this disk sample frame respectively, and the number of degrees of the angle of per two adjacent these lines are identical.

3, rotation specimen holder according to claim 1 is characterized by, and this stepper motor is connected with the controller that a pair of its rotating speed is controlled.

4, rotation specimen holder according to claim 1 is characterized by, and this D translation platform is provided with the knob of an adjusting sample circular hole initial position.

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