The invention discloses a concrete temperature stress testing machine with a temperature deformation self-compensation function and belongs to the technical field of concrete temperature stress and deformation testing simulation. A polished rod is manufactured from No.4J36 invar, a left fixed end, a right fixed end, fixed end universal joints and movable end universal joints are manufactured from No.4J36 invar, and a fixed chuck, a movable chuck and a load sensor are manufactured from No.45 steel. Parts of the testing machine are made from different steel materials, the combination length of the parts is designed according to a certain proportion, when outside temperature changes, the total temperature deformation difference generated by all steel parts of the concrete temperature stress testing machine can be zero, accordingly temperature deformation, caused by outside temperature change, of steel of the testing machine is offset, and temperature deformation self-compensation of the testing machine is achieved.

Low-temperature interferometer

Concrete temperature stress testing machine with temperature deformation self-compensation function

The invention discloses a low-temperature adjustable visual field diaphragm of an imaging type infrared Fourier transform spectrum detector, which comprises a differential head, a differential head support, a locking mechanism, a corrugated pipe, a heat insulation pipe, a heat insulation nut, a right moving piece connecting rod, a left moving piece connecting rod, a diaphragm support and a cold link port. The left moving piece connecting rod and the right moving piece connecting rod are arranged in the diaphragm support, the heat insulation nut and the heat insulation pipe are respectively screwed on the left moving piece connecting rod and the right moving piece connecting rod, the corrugated pipe is fixed on the wall surface of a cold box through screws, the heat insulation pipe is connected with the threads in the corrugated pipe, the locking mechanism is sleeved on the round pin of the corrugated pipe, the differential head supported by the differential head and clamped and fixed by a screw, sticks against the round pin of the corrugated pipe, and the heat insulation pipe is pressed by the heat insulation nut. The differential head at room temperature is manually adjusted to drive the left and right moving plate connecting rods at low temperature in vacuum, the central position and the width of the low-temperature diaphragm are quantitatively and precisely adjusted, and themechanical locking can be carried out. The detector has simple structure, needs no complicated electric measurement and electric regulation system at low-temperature in vacuum, and has no pollution.

Low-temperature adjustable visual field diaphragm of imaging type infrared Fourier transform spectrum detector

The utility model relates to a low temperature infrared optical system, which belongs to the technical field of a Lacasitan optical system. The utility model is characterized in that the bottom of a concave primary mirror is an elastic bottom edge, a basal plate is grid-shaped, a convex secondary mirror is fixed on a plane which is determined by at least three support rods of a bracket, the plane is parallel with the basal plate; the natural frequency of the bracket is larger than the excitation frequency of the environment, and the components and optical elements of the utility model are made of same aluminium alloy. The utility model has the advantages of large caliber, light weight, etc., and the utility model can conduct high-speed refrigeration to achieve temperature balance and can achieve the imaging quality of diffraction limit under a low temperature.

Low-temp. infrared optical system

The utility model discloses a combined Michelson interferometer, which has a basal seat, wherein, a small hole screen, a spectroscopic plate, a compensating plate, and a fixed mirror are orderly arranged on an optical axis which is parallel to the basal plane of the basal seat on one side of the basal seat; a miniature shifter is arranged on a vertical optical axis on the other side of the basal seat; a shifting mirror is fixed on the miniature shifter; the shifting amount of the shifting mirror is 0 to 15 mm. The utility model has the advantages of low cost, simple structure, miniaturization, convenient operation, and visible optical path, and the utility model can be used for replacing the function of the traditional Michelson interferometer.

Low-temperature interferometer

Citations

Concrete temperature stress testing machine with temperature deformation self-compensation function

Low-temperature adjustable visual field diaphragm of imaging type infrared Fourier transform spectrum detector

References

Low-temp. infrared optical system

Combined Michelson interferometer

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