35 results about "Photometric system" patented technology

This invention provides a highly stable optical microscope that prevents drift and makes it possible to record images or take measurements for several hours with accuracy in the order of nanometers. The highly stable optical microscope of this invention includes the support structure (41) that accommodates and supports components including the optical imaging system, straight tube (28) that accommodates and supports components including the optical photometric system, and support structure (7) that accommodates and supports components including the illumination system. These support structures have a hollow pyramid or conical shape with a low center of gravity. The highly stable optical microscope of this invention features the objective lenses, imaging lenses, optical imaging and photometric systems that are mounted, forming a straight line, on the supporting structures that are symmetrical about the optical axis in both shape and mass.

In an image forming apparatus, the auto-focusing process and the photometry system may be coupled such that when a multi-area AF system is set, the setting of the auto-focusing areas of the multi-area AF system is performed in accordance with a selected photometry system. More specifically, when an average metering system is selected as the photometry system, nine AF areas are set such that the AF areas are distributed throughout the whole image. When a center-weighted metering system is selected as the photometry system, four AF areas are set in the vicinity of the middle of the image. When a spot metering system is selected as the photometry system, one AF area is set in the vicinity of the middle of the image.

A method for controlling the gain and zero of a multiple pixel photon counter device, and light-measuring system implementing said method.Signals provided by the device are acquired for predefined periods, until a predefined total measurement time is reached, an amplitude histogram is formed from the acquired signals, the positions of two consecutive peaks, measurable on the histogram, are determined, an error signal is produced, which is equal to the deviation between both peaks and, by means of the same, the voltage supplying the device is regulated, so as to keep the deviation equal to a predefined set point.

Disclosed is a sunlight automatic tracking system for a three-dimensional photovoltaic cell, comprising: a CPU control circuit, a servo drive circuit and a photometric system which are electrically connected successively, wherein the photometric system is installed on a solar light board; the photometric system outputs an X-axis pulse signal, a Y-axis pulse signal and a Z-axis pulse signal to the CPU control circuit; the CPU control circuit controls the operation of a first motor in the servo drive circuit via a first pulse signal, a first operating state control signal and a first direction control signal; the CPU control circuit controls the operation of a second motor in the servo drive circuit via a second pulse signal, a second operating state control signal and a second direction control signal; the first motor and the second motor drive the solar light panel to rotate; and the CPU control circuit initializes the first pulse signal, the first direction control signal, the second pulse signal and the second direction control signal via the Z-axis pulse signal. The system reduces usage costs and improves the working efficiency.

The invention provides a method and device for calibrating a spatial optical measurement system, which specifically includes: according to a preset projection rule, making the tracer beam scanning system project a tracer of a known vector into the public field of view of a multi-eye vision equipment group Beam, solve the control line equation of the tracer beam in the world coordinate system; make the multi-eye vision equipment group collect the two-dimensional image of the tracer beam in each visual device, and solve the image line equation of the tracer beam in the target surface coordinate system; Intrinsic parameters and / or extrinsic parameters of each visual device are calculated by bundle adjustment method or least squares method. Then, through the principle of coordinate transfer, the spatial conversion relationship between the various visual devices is solved to complete the calibration. The calibration method and device provided by the present invention utilize the linear characteristics of the tracer beam for calibration, without any space cooperation target or target plate, which reduces the calibration difficulty of the optical measurement system, especially the large-space optical measurement system, and improves the calibration efficiency. precision and stability.

The invention discloses a method of constructing light-measuring look-up table, a light-measuring method, and a light-measuring system. The method of constructing light-measuring look-up table is to construct a look-up table by according to spectrum parameters relative to a light spectrum model, three actual color-matching functions relative to the light-measuring system and three standard color-matching functions, calculating both a look-up color coordinate and a reference color coordinate corresponding to each of the spectrum parameters. The light-measuring method includes: first, measuring a to-be-measured light by the light-measuring system to obtain actual stimulus values and calculating an actual color coordinate; then, comparing the actual color coordinate with the look-up color coordinates to determine both a to-be-measured light spectrum parameter and an estimated color coordinate relative to the to-be-measured light; furthermore, according to the to-be-measured light spectrum parameter, one of the standard color-matching functions and one of the actual stimulus values, calculating an estimated luminance.

The invention discloses a voltage frequency conversion circuit for a photometric system. The voltage frequency conversion circuit is characterized in that the comparison input pin of a converter is connected with a second resistor; a timing circuit pin of the converter is connected with a third resistor and a second capacitor respectively; the third resistor and the power end of the converter are connected with a 9V power supply through a first inductor, and the 9V power supply is further connected with a third capacitor; the frequency output pin of the converter is connected with a fourth resistor, the fourth resistor is connected with the base electrode of a second triode, the emitting electrode of the second triode is connected with a fifth resistor and a sixth resistor respectively, and the fifth resistor is connected to the ground; the collector electrode of the second triode is connected with a seventh resistor which is connected with the 9V power supply, the sixth resistor is connected with an eighth resistor and the base electrode of a first triode respectively, the emitting electrode of the first triode is connected to the ground, and the collector electrode of the first triode is connected with a ninth resistor and outputs pulse signals at the same time. According to the voltage frequency conversion circuit, sunlight conversion frequency is improved, accuracy is high, the circuit is simple in structure, and various requirements in practical application are met.

The invention discloses a transmission-type smoke meter capable of measuring valid smoke column length and a method for measuring valid smoke column length with the transmission-type smoke meter. The smoke meter is mainly characterized in that the outlet of the detecting path of the smoke meter is provided with a transparent sheet capable of observing the bending flow of detected gas, and a straight line representing the optical axis of the photometric system of the smoke meter is marked on the transparent sheet. The measuring method is mainly characterized in that coloured gas passes throughthe detecting path and an air curtain of the smoke meter; the optical distance of a light beam of the photometric system of the smoke meter in the bending flow of the coloured gas can be obtained by observing the straight line on the transparent sheet, and the obtained optical distance and the optical distance of the coloured gas in the detecting path are added to obtain the valid smoke column length of the smoke meter. The invention has the advantages that the transmission-type smoke meter has more scientificity, seriousness, objectivity and impartiality.