39results about How to "Reduce stray light interference" patented technology

The invention discloses a low-stray-light fast spectrometer and a measurement method thereof. The spectrometer includes a light signal collection mechanism and an optical platform and is characterized in that the optical platform includes a bandpass color wheel; a group of bandpass color filters and via-holes are arranged on the bandpass color wheel; and an incident light reaches a dispersive element through the bandpass color filters or the via-holes, is split and then received by an array detector. Through rotation of the bandpass color wheel, the incident light scans the bandpass color filters one by one, and the spectrometer accurately detects a sample to be detected segment by segment to correspond to a response function. When a similar sample with similar spectral characteristics ismeasured, the sample is accurately detected segment by segment and is subjected to full-spectrum fast detection through the via-holes, the stray light correction factor can be calculated according tothe two measurement results, and the similar sample is subjected to the full-spectrum fast detection and is corrected by the stray light correction factor to achieve fast accurate detection. The method can effectively reduce the measurement stray light of the fast spectrometer and fast accurately measure the spectrum curves and related spectroradiometric parameters of the sample with similar spectral characteristics.

The invention discloses an ultraviolet spectrophotometer, detecting head, and relates to an ultraviolet spectrophotometer. The invention provides a small portable ultraviolet spectrophotometer detecting head which not only has the advantages of small volume, high sensitivity and corrosion resistance, but also can be separated from an instrument host computer and used as soon as being connected, and meet the requirement on real-time detection of fields and sites. The ultraviolet spectrophotometer detecting head is provided with an incident optical fiber, an incident optical fiber connector, a return optical fiber connector, an incident optical fiber collimator, a return optical fiber collimator, a return optical fiber, an upper shell, a lower shell, conical surface reflection prisms and a sample pool, wherein an output end of the incident optical fiber is connected with an input end of the incident optical fiber connector; an output end of the incident optical fiber connector is connected with the incident optical fiber collimator; output light of the incident optical fiber collimator enters the return optical fiber collimator after being reflected by more than one odd number of theconical surface reflection prisms arranged in the sample pool; an output end of the return optical fiber collimator is connected with an input end of the return optical fiber connector; an input endof the return optical fiber connector is connected with the input end of the return optical fiber; and the sample pool is arranged in a cavity between the upper shell and the lower shell.

The invention concerns a measurement device to capture at least one vital parameter of a person in a motor vehicle with a steering wheel. The measurement device includes a finger sensor device with an optical sensor device, where the finger sensor device is attached to the steering wheel in the transition zone between a steering wheel spoke and the hub of the steering wheel.

The invention provides a conduction-type polarizing and beam-splitting synchronized lighting device. The lighting device comprises a light source, a light guide stick, a polarizing and beam-splitting prism, a first lens, a polarized light conversion unit and a second lens, wherein light emitted by the light source is focused on the light guide stick; the incident face of the polarizing and beam-splitting prism is bonded with the exit face of the light guide stick; the polarizing and beam-splitting prism divides incident light into a first linearly polarized light and a second linearly polarized light; the first lens projects the first linearly polarized light to one of a plurality of first projectors; the polarized light conversion unit converts the polarization direction of the second linearly polarized light to be the same as that of the first linearly polarized light; and the second lens projects the second linearly polarized light of which the polarization direction is converted to one of a plurality of second projectors. The lighting device adopts the polarizing and beam-splitting prism to divide natural light of the light source into two paths of linearly polarized light, converts natural light into linearly polarized light while achieving beam-splitting, improves the light efficiency and lowers interference of parasitic light in the projectors.

The invention discloses a space filtering based light shield of a star sensor. The light shield comprises a cover casing and first to sixth shading rings, and the first to sixth shading rings are arranged from an entrance pupil position to the exit pupil position sequentially and mounted in the cover casing; the first shading ring and the sixth shading ring are arranged at the two ends of the cover casing opposite to each other, and a connecting line between cutting edges of the first shading ring and the sixth shading ring and a center line of the cover casing form an included angle of 16 degree; and the middle portions of the fourth, fifth and sixth shading rings are provided with optical filters in a rotational installation manner respectively. The light shield has the advantages that the cover casing, the shading rings and the optical filters form an optical-mechanical assembly of the light shield, and it is ensured that the star sensor can output effective attitude data when a sun shielding angle is greater than 20 degree; a non-imaging spectrum of the sun shielding angle greater than 20 degree can reach the entrance pupil position of an optical system via at least twice absorptive scattering; and the light shield has a high light shielding performance, and is capable of spectrum filtering.

The invention relates to a laser vibration measurement system which comprises a laser unit (1), a focus imaging unit (2), a focusing unit (3) and a control unit (4), wherein the focus imaging unit (2)is connected with the laser unit (1); the focusing unit (3) is connected with the focus imaging unit (2), wherein the control unit (4) is connected with the focus imaging unit (2) and the focusing unit (3). The laser vibration measurement system provided by the invention can automatically complete the identification and the vibration measurement of an object, so that the manual operation processis reduced. Meanwhile, as laser is adopted for the vibration measurement, manual focusing, identification and other processes are not required in the whole process, so that the injury to an operator is avoided, and the safety of the whole measurement system is improved. The measurement system provided by the invention realizes the coaxial synchronization of laser focusing and image acquisition during the laser vibration measurement, so that the measurement accuracy and the measurement efficiency of the whole measurement system are improved.