In order to evaluate the integrated properties of visible photoelectric imaging system exactly and objectively ,the calibration equipment was developed .The equipment was com‐posed of integrating sphere ,standard card ,off‐axis reflective collimator ,mechanical adjust‐ment bench ,video acquisition module and comprehensive software .It could complete a meas‐urement of resolution ,contrast ,optical transfer function(MTF) ,noise power spectrum ,noise equivalent light and sensitivity .For a certain visible photoelectric imaging product ,the effec‐tiveness of the equipment was proved .The comprehensive parameter measurements are given :the cut‐off frequency is 39 .4 mm-1 , the contrast is 76 .5% ,the root‐mean‐square (RMS ) noise is 2 .14 mV ,the noise equivalent light (NEL ) is 0 .045 5 cd/m2 and the sensitivity is 47 mV · (cd/m2 )-1 . In addition ,an illuminometer and a standard video pattern generator were respectively adopted for making calibration , results show that the maximum relative measurement errors of integrating sphere and the signal acquisition system are -2 .3% and 1% .

The optical transfer function(OTF) is an important parameter of image quality for optical system.As modern OTF measurement equipments just covered visible light and infrared band,the ultraviolet OTF(260 nm~400 nm) measurement equipment was designed.The theory and the components of the testing equipment were introduced.The equipment was calibrated by the OTF standard lens with centric wavelengths of 300 nm and 380 nm.The results show that the errors between theory and measurement of MTF are ±0.03(on-axis) and ±0.05(off-axis).Finally,the uncertainty of equipment measurement is evaluated.

The mathematic model for distortion is discussed.The distortion measurement with a precision goniometer and a bench comparator is introduced.The pixel distance equivalent of the CCD detector was calculated by the magnification method.The centroid of point target was derived by the centroid method.The pixel distance between the centroid and the origin on the image plane was multiplied by the pixel distance equivalent to achieve accurate distance.The absolute distortion was acquired by tangent function.The equation was worked out to calculate the coefficient.The results of the calculation and data processing indicate that the fitting effect of the distortion mathematic model is satisfactory in medium field of view.

Calibration specification is the base for carrying out the calibration.Drafting the calibration specification of IR optical focal length measuring equipment is a very important object,it is the basic requirement for metrological assurance.The calibration specification of IR optical focal length measuring equipment not only applying to metrological service,to guarantee the accuracy,compatibility and traceability of daily calibration works,but provided the technology basis for the branch that produces infrared optics system focal distance measuring device,at the same time satisfies request of the consumer who use the infrared optics system focal distance measuring systematic in the process applying for various attestation.In this paper,construction,methods of calibration,and evaluation of uncertainty of the calibration specification for IR optical focal length measuring equipment are described.

Digital laser plane interferometer is used to measure the surface of optical components and the wavefront aberration of nonconfocal optical system.In order to unify digital laser interferometer measurement values,and guarantee the accuracy and traceability of the measured results,the digital laser interferometer calibration standard was laid down.The constitution of the calibration specification for digital laser plane interferometer is introduced.The specifications for the instruments under test,the main calibration parameters and the calibration method are described.

The equipment provided with all necessary function of testing,not only can measu re the OTF of camera and afocal system, but also measure focal length, angular m agnification and transmission and so on. By measurement the OTF standard lens w ere cal ibrated, the OTF international comparison work was done, laying a foundation the OTF metr ology standard was established. The equipment uncertainty measurement of MTF is on-axis 0.03, off-axis: 0.05 from visible to near infrared; on-axis: 0.04, of f-axis: 0.06 in infrared. The repeatability of the system is 0.01(RMS). And im portant performance of the system reach international advanced level at present .

The development of OTF standard lens is a key link in the calibration of OTF tester.It is shown that the theoretic design values are in essential agreement with the measured values,and the OTF standard lens can be used as an OTF delivery standard.