Here's a command-line script I posted a long time ago: xls2tsv -- it's so old it still uses Spreadsheet::ParseExcel (i.e. it assumes the old "xls" format rather than "xlsx"), but apparently, you are already using a module that handles your particular Excel spreadsheets, so the basic point that is relevant here is:

my $xl = Spreadsheet::ParseExcel->new;  # or whatever module/version w
+orks
my $wb = $xl->Parse( $filepath ) or die "$filepath: $!\n";

for my $sheet ( @{$wb->{Worksheet}} ) {
    $sheet->{MaxRow} ||= $sheet->{MinRow};
    for my $row ( $sheet->{MinRow} .. $sheet->{MaxRow} ) {
        $sheet->{MaxCol} ||= $sheet->{MinCol};
        for my $col ( $sheet->{MinCol} .. $sheet->{MaxCol} ) {
            my $cell = $sheet->{Cells}[$row][$col];
            my $val = $cell->{Val};

            if ( $cell->{Code} eq 'ucs2' ) {
                $val = decode( "UTF-16BE", $val );

                if ( $val =~ /\p{Han}/ ) {
                    # this cell contains Chinese characters
                }
                # NB: there may be non-ASCII Unicode characters that a
+re not Chinese
            }
        }
    }
}
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