Abstract
The artificial compound eye (ACE) structure is a new type of miniaturized, lightweight and intelligent imaging system. This paper has proposed to design a multi-spectral ACE structure to enable the structure to achieve multi-spectral information on the basis of imaging. The sub-eyes in the compound eye structure have been designed as diffractive beam splitting lenses with the same focal length of 20 mm, but with the different designed center wavelengths of 650 nm, 532 nm, and 445 nm, respectively. The proximity exposure lithography and reactive ion etching process were used to prepare the designed multi-spectral ACE structure, and the spectral splitting and multi-spectral imaging experiments were carried out to verify the multi-spectral imaging function of the structure without axial movement. Furthermore, the structure can be designed according to actual requirements, which can be applied to covert reconnaissance, camouflage identification, gas leakage or other fields.
Highlights
Compound eyes of arthropods such as ants, flies and bugs have attracted extensive research interests due to their unique features such as wide fields of view (FOV), high sensitivities to motions and infinite depths of field [1,2,3,4,5,6,7,8]
Several attempts were made to develop artificial compound eyes (ACEs) to realize imaging [12,13,14,15], which typically analyzes the spatial characteristics of the target by studying the shape information of the target
Diffraction optical spectrum imaging is a staring imaging technology based on the diffractive beam splitting lenses, which can simultaneously image the scene in the field of view and read it out by using a focal plane array detector at one time
Summary
Compound eyes of arthropods such as ants, flies and bugs have attracted extensive research interests due to their unique features such as wide fields of view (FOV), high sensitivities to motions and infinite depths of field [1,2,3,4,5,6,7,8]. Diffraction optical spectrum imaging is a staring imaging technology based on the diffractive beam splitting lenses, which can simultaneously image the scene in the field of view and read it out by using a focal plane array detector at one time. On the basis of making full use of the spectral imaging advantages of diffractive beam splitting lenses, different sub-eye imaging channels of the compound eye are designed to capture spectral information of different bands at the same distance avoiding the use of axial distance adjusting device, which can effectively reduce the dependence of the acquisition of different spectral information on the distance between the lens and the detector so that the ACEs can realize multi-spectral imaging function on the basis of imaging, which can be used in concealment reconnaissance, camouflage recognition, toxic gas leakage and other fields. The maximum number of annular Tlabtacehancahnencnnesoundd,brD,lseetdahasiiorcfiecnagffcbegldnotacrhereutnwodsenldiaiatgFscntvnoeosgoedrurfwlrtmbeoetthon-asueFvepgolyoeatocbehrlnosetm(a2rd(nrλiau)gine,nrilt0seathtg)phh(acoes(e2onλnu)rcm,ddbaot-d)ihpmtnehiaeoygupenserslesdafeudlo(dtertebcinihauon-dsee)lfseiylcsfs(deeotornriicrlfisgearbf)eentlduhsrcsletepoeeit(nonrsoeFrtngnr)iems,tdasohwdpnifinneon(hagFtenunie)dcdlntr,haomiuwbrncldyigahasnirntitftecrhfobduhebeardcebnectaiyuancfdpfanrtseteelhrncrsbseetutu.eunrlamuTratcpecthanbeetle(uuedcrDrtumrmuebilo)arbyfafetoeoxeFarfr(idnDomotdrnhfbiii)muufeyafomlenusfaFrnulrteoanhubnbru(el-mta1aemssn)ryu.uudbeblTbbaesal--hrenee((en1ndyyon)sieesf.),, (lenn)sceas,nabnedcsaolcmuelartaeddituosovbatlauienstahreecsohmowplnetiendTiastbrliebu1:tion of annular bands structure for different subeye lenses, and some radius values are shown in Table 1: NNi ii== ((DDFFiiiλ/λ/i20ii200))222,,ii== 11,,22,,33;;
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